{
  "success": {
    "v": 2,
    "license": "CC-BY 4.0",
    "data": [
      {
        "source_id": 14,
        "name": "Cedar City, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the Cedar City 30' x 60' \nquadrangle, Iron and Washington Counties, Utah",
        "authors": "Rowley P.D., Williams V.S., Vice G.S., Maxwell D.J., Hacker D.B., Snee L.W., and Mackin J.H.",
        "ref_year": "2008",
        "ref_source": "Utah Geological Survey Open-File Report 476DM, revised version, scale 1:100,000",
        "isbn_doi": "",
        "scale": "large",
        "features": 3986,
        "area": 4891
      },
      {
        "source_id": 20,
        "name": "Oregon",
        "url": "http://www.oregongeology.org/pubs/dds/p-OGDC-6.htm",
        "ref_title": "Oregon Geologic Data Compilation, release 6",
        "authors": "R.L. Smith, W.P. Roe (compilers)",
        "ref_year": "2015",
        "ref_source": "State of Oregon Department of Geology and Mineral Industries",
        "isbn_doi": "",
        "scale": "large",
        "features": 120049,
        "area": 250841
      },
      {
        "source_id": 89,
        "name": "Joshua Tree National Park",
        "url": "https://pubs.er.usgs.gov/publication/ofr20151175",
        "ref_title": "Geology of Joshua Tree National Park",
        "authors": "Powell, R.E., J.C. Matti, P.M. Cossette",
        "ref_year": "2015",
        "ref_source": "U.S. Geological Survey Open-File Report 2015-1175",
        "isbn_doi": "",
        "scale": "large",
        "features": 21033,
        "area": 3568
      },
      {
        "source_id": 157,
        "name": "Lander, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-lander-30-x-60-quadrangle-fremont-county-wyoming-2009/",
        "ref_title": "Geologic Map Of The Lander 30' X 60' Quadrangle, Fremont County, Wyoming",
        "authors": "Johnson, J.F. and W.M. Sutherland",
        "ref_year": "2009",
        "ref_source": "Wyoming State Geological Survey Map Series 87",
        "isbn_doi": "",
        "scale": "large",
        "features": 1755,
        "area": 4548
      },
      {
        "source_id": 86,
        "name": "Contra Costa County, CA",
        "url": "http://pubs.usgs.gov/of/1994/of94-622/",
        "ref_title": "Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California",
        "authors": "Graymer, R.W., D.L. Jones, E.E. Brabb",
        "ref_year": "1994",
        "ref_source": "U.S. Geological Survey Open-File Report 94-622",
        "isbn_doi": "",
        "scale": "large",
        "features": 2408,
        "area": 1950
      },
      {
        "source_id": 188,
        "name": "Midwest Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-midwest-30-x-60-quadrangle-natrona-converse-johnson-and-campbell-counties-wyoming-2007/",
        "ref_title": "Geologic map of the Midwest 30' x 60' quadrangle, Natrona, Converse, Johnson, and Campbell counties, Wyoming",
        "authors": "Wittke, S.J.",
        "ref_year": "2007",
        "ref_source": "Wyoming State Geological Survey Map Series 73",
        "isbn_doi": "",
        "scale": "large",
        "features": 241,
        "area": 4511
      },
      {
        "source_id": 55,
        "name": "Twin Cities, MN",
        "url": "http://conservancy.umn.edu/handle/11299/154925",
        "ref_title": "M-194 Bedrock Geology of the Twin Cities Ten-County Metropolitan Area, Minnesota",
        "authors": "Mossler, J.H.",
        "ref_year": "2013",
        "ref_source": "University of Minnesota Digital Conservancy",
        "isbn_doi": "",
        "scale": "large",
        "features": 2795,
        "area": 12659
      },
      {
        "source_id": 167,
        "name": "Providence Mountains, CA",
        "url": "https://pubs.er.usgs.gov/publication/sim3376",
        "ref_title": "Geologic map of the Providence Mountains in parts of the Fountain Peak and adjacent 7.5' quadrangles, San Bernardino County, California",
        "authors": "Stone, P., D.M. Miller, C.H. Stevens, J.J. Rosario, J.A. Vazquez, E. Wan, S.S. Priest, Z.C. Valin",
        "ref_year": "2017",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3376",
        "isbn_doi": "doi: 10.3133/sim3376",
        "scale": "large",
        "features": 1801,
        "area": 155
      },
      {
        "source_id": 242,
        "name": "NE Carcajou Canyon, NWT",
        "url": "https://doi.org/10.4095/292287",
        "ref_title": "Geology, Carcajou Canyon (northeast), Northwest Territories, scale 1:100,000",
        "authors": "Fallas, K.M., T. Hadlari, B.C. MacLean.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 95",
        "isbn_doi": "doi: 10.4095/292287",
        "scale": "large",
        "features": 67,
        "area": 2654
      },
      {
        "source_id": 273,
        "name": "Bathurst, New South Wales",
        "url": "https://search.geoscience.nsw.gov.au/product/43",
        "ref_title": "Bathurst 1:100 000 First Edition (1:100,000 geological map 8831)",
        "authors": "Watkins J.J., Pogson D.J., Hawley S.P. and Henderson G.A.M.",
        "ref_year": "1997",
        "ref_source": "Geological Survey of New South Wales, Sydney / Australian Geological Survey Organisation, Canberra",
        "isbn_doi": "",
        "scale": "large",
        "features": 481,
        "area": 2584
      },
      {
        "source_id": 255,
        "name": "Carcajou Canyon, NWT",
        "url": "https://doi.org/10.4095/292286",
        "ref_title": "Geology, Carcajou Canyon (northwest), Northwest Territories, scale 1:100,000",
        "authors": "Fallas, K.M. and MacNaughton, R.B.",
        "ref_year": "2014",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 94",
        "isbn_doi": "doi: 10.4095/292286",
        "scale": "large",
        "features": 270,
        "area": 2654
      },
      {
        "source_id": 185,
        "name": "Stephens City Quad, VA",
        "url": "https://pubs.usgs.gov/of/2006/1173/",
        "ref_title": "Geologic Map of the Stephens City Quadrangle, Clarke, Frederick, and Warren Counties, Virginia",
        "authors": "Weary, D.J., R.C. Orndorff, W. Alemán-González",
        "ref_year": "2006",
        "ref_source": "U.S. Geological Survey Open-File Report 2006-1173",
        "isbn_doi": "",
        "scale": "large",
        "features": 32,
        "area": 150
      },
      {
        "source_id": 209,
        "name": "White Hills, AZ",
        "url": "https://pubs.er.usgs.gov/publication/sim3372",
        "ref_title": "Geologic map of the northern White Hills, Mohave County, Arizona",
        "authors": "Priest, S.S., S.C. Lundstrom, D.L. Block",
        "ref_year": "2017",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3372",
        "isbn_doi": "doi:10.3133/sim3372",
        "scale": "large",
        "features": 1264,
        "area": 469
      },
      {
        "source_id": 194,
        "name": "Reno Junction Quad, UT",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-reno-junction-30-x-60-quadrangle-campbell-and-weston-counties-wyoming-2004/",
        "ref_title": "Geologic Map Of The Reno Junction 30' X 60' Quadrangle, Campbell And Weston Counties, Wyoming",
        "authors": "Ver Ploeg, A.J., and C.S. Boyd",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Map Series 62",
        "isbn_doi": "",
        "scale": "large",
        "features": 1028,
        "area": 4474
      },
      {
        "source_id": 177,
        "name": "Farson Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/preliminary-bedrock-geologic-map-of-the-farson-30-x-60-quadrangle-sweetwater-sublette-and-fremont-counties-wyoming-2011/",
        "ref_title": "Preliminary Bedrock Geologic Map Of The Farson 30' X 60' Quadrangle, Sweetwater, Sublette And Fremont Counties, Wyoming",
        "authors": "Sutherland, W.M., and S.C. Luhr",
        "ref_year": "2011",
        "ref_source": "Wyoming State Geological Survey Open File Report 11-6",
        "isbn_doi": "",
        "scale": "large",
        "features": 515,
        "area": 4583
      },
      {
        "source_id": 137,
        "name": "Greenwood, AL",
        "url": "https://ngmdb.usgs.gov/Prodesc/proddesc_78257.htm",
        "ref_title": "Geologic Map of the Greenwood 7.5-Minute Quadrangle, Jefferson and St. Clair Counties, Alabama",
        "authors": "Ward, W.E., and W.E. Osborne",
        "ref_year": "2006",
        "ref_source": "Geological Survey of Alabama Quadrangle Series 44",
        "isbn_doi": "",
        "scale": "large",
        "features": 76,
        "area": 161
      },
      {
        "source_id": 146,
        "name": "Bartholomew County, IN",
        "url": "https://igws.indiana.edu/research/ProjectSheet.cfm?sheet_id=172&type=Researchers&IDNum=24#section100",
        "ref_title": "Bedrock geologic map of Bartholomew County",
        "authors": "Hasenmueller, W.A. and R.F. Rupp",
        "ref_year": "2017",
        "ref_source": "Indiana Geological and Water Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 131,
        "area": 1061
      },
      {
        "source_id": 243,
        "name": "SE Norman Wells, NWT",
        "url": "https://doi.org/10.4095/292292",
        "ref_title": "Geology, Norman Wells (southeast), Northwest Territories, scale 1:100,000",
        "authors": "Fallas, K.M and R.B. McNaughton",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 100",
        "isbn_doi": "doi: 10.4095/292292",
        "scale": "large",
        "features": 57,
        "area": 2605
      },
      {
        "source_id": 149,
        "name": "Cheyenne, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-cheyenne-30-x-60-quadrangle-southeastern-wyoming-western-nebraska-and-northern-colorado-1995/",
        "ref_title": "Geologic Map Of The Cheyenne 30’ X 60’ Quadrangle, Southeastern Wyoming, Western Nebraska And Northern Colorado",
        "authors": "Ver Ploeg, A.J.",
        "ref_year": "1995",
        "ref_source": "Wyoming State Geological Survey Map Series 46",
        "isbn_doi": "",
        "scale": "large",
        "features": 586,
        "area": 4659
      },
      {
        "source_id": 195,
        "name": "Buffalo Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-buffalo-30-x-60-quadrangle-johnson-and-campbell-counties-wyoming-2002/",
        "ref_title": "Geologic map of the Buffalo 30' x 60' quadrangle, Johnson and Campbell counties, Wyoming",
        "authors": "Ver Ploeg, A.J., and C.S. Boyd",
        "ref_year": "2002",
        "ref_source": "Wyoming State Geological Survey Map Series 59",
        "isbn_doi": "",
        "scale": "large",
        "features": 1162,
        "area": 4437
      },
      {
        "source_id": 213,
        "name": "Lac Maunoir, Northwest Territories",
        "url": "https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=306205",
        "ref_title": "Bedrock geology, Lac Maunoir, Northwest Territories",
        "authors": "Fallas, K.M.",
        "ref_year": "2018",
        "ref_source": "Canadian Geoscience Map 311",
        "isbn_doi": "",
        "scale": "large",
        "features": 14,
        "area": 9529
      },
      {
        "source_id": 235,
        "name": "SW Mahony Lake, NWT",
        "url": "https://doi.org/10.4095/292283",
        "ref_title": "Geology, Mahony Lake (southwest), Northwest Territories, scale 1:100,000",
        "authors": "Fallas, K.M., B.C. MacLean, T. Hadlari",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 91",
        "isbn_doi": "doi: 10.4095/292283",
        "scale": "large",
        "features": 51,
        "area": 2605
      },
      {
        "source_id": 274,
        "name": "Bunda, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/16",
        "ref_title": "Bunda 1:100,000 Geological Sheet 7434, Second Edition",
        "authors": "Mills, K.J. and Hicks, M.G.",
        "ref_year": "2016",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 713,
        "area": 2626
      },
      {
        "source_id": 220,
        "name": "New Windsor, MD",
        "url": "http://www.mgs.md.gov/publications/data_pages/quadrangle_geo.html",
        "ref_title": "Geologic Map of the New Windsor Quadrangle, Carroll County, Maryland",
        "authors": "Reger, J.P., D.K. Brezinski, S. Southworth, H.A. Quinn",
        "ref_year": "2004",
        "ref_source": "Maryland Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 196,
        "area": 153
      },
      {
        "source_id": 196,
        "name": "Kaycee Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-kaycee-30-x-60-quadrangle-johnson-and-campbell-counties-wyoming-2003/",
        "ref_title": "Geologic map of the Kaycee 30' x 60' quadrangle, Johnson, and Campbell counties, Wyoming",
        "authors": "Ver Ploeg, A.J., C.S. Boyd and J.M. Mulbay",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Map Series 63",
        "isbn_doi": "",
        "scale": "large",
        "features": 1110,
        "area": 4475
      },
      {
        "source_id": 47,
        "name": "Logan, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic Map of the Logan 30x60 Quad.",
        "authors": "Dover, J.H.",
        "ref_year": "1995",
        "ref_source": "Utah Geological Survey Miscellanceous Publication MP06-8 DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 5341,
        "area": 4624
      },
      {
        "source_id": 231,
        "name": "Ware, BC",
        "url": "https://doi.org/10.4095/295723",
        "ref_title": "GIS dataset of geology, Ware (94F), British Columbia",
        "authors": "Fallas, K.M. and A.V. Okulitch",
        "ref_year": "2015",
        "ref_source": "Geological Survey of Canada, Open File 5339",
        "isbn_doi": "doi: 10.4095/295723",
        "scale": "large",
        "features": 621,
        "area": 13354
      },
      {
        "source_id": 204,
        "name": "Dugway Proving Grounds",
        "url": "https://geology.utah.gov/map-pub/maps/gis/#tab-id-4",
        "ref_title": "Geologic map of Dugway Proving Ground and adjacent areas, Tooele County, Utah",
        "authors": "Clark, D.L., C.G. Oviatt, and D. Page",
        "ref_year": "2016",
        "ref_source": "Utah Geological Survey Map 274DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 2514,
        "area": 4620
      },
      {
        "source_id": 266,
        "name": "S Sylvia Grinnell Lake, NU",
        "url": "https://doi.org/10.4095/298757",
        "ref_title": "Geology, Sylvia Grinnell Lake (south), Baffin Island, Nunavut (preliminary), scale 1:100,000",
        "authors": "St-Onge, M.R., O.M. Weller, B.J. Dyck, N.M. Rayner, T. Chadwick, D. Liikane",
        "ref_year": "2016",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 254S",
        "isbn_doi": "doi: 10.4095/298757",
        "scale": "large",
        "features": 30,
        "area": 5406
      },
      {
        "source_id": 267,
        "name": "Gosford-Lake Macquarie, New South Wales",
        "url": "https://search.geoscience.nsw.gov.au/product/9084",
        "ref_title": "Gosford-Lake Macquarie Special 1:100 000 Geological Sheet 9131 & part sheet 9231",
        "authors": "Och, D.J., D.C. Jones, R.E. Uren, and K.S. Hughes (compilers)",
        "ref_year": "2015",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 625,
        "area": 3876
      },
      {
        "source_id": 232,
        "name": "Catoctin Furnace, MD",
        "url": "http://www.mgs.md.gov/publications/data_pages/quadrangle_geo.html",
        "ref_title": "Geologic Map of the Catoctin Furnace Quadrangle, Frederick County, Maryland",
        "authors": "Brezinski, D.K.",
        "ref_year": "2004",
        "ref_source": "Maryland Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 36,
        "area": 149
      },
      {
        "source_id": 67,
        "name": "Nephi, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Nephi 30′ x 60′ quadrangle, Carbon, Emery, Juab, Sanpete, Utah, and Wasatch Counties, Utah",
        "authors": "Witkind,I.J., M.P. Weiss",
        "ref_year": "1991",
        "ref_source": "Miscellaneous Investigations Series Map I-1937",
        "isbn_doi": "",
        "scale": "large",
        "features": 2041,
        "area": 4758
      },
      {
        "source_id": 256,
        "name": "SW Carcajou Canyon, NWT",
        "url": "https://doi.org/10.4095/292289",
        "ref_title": "Geology, Carcajou Canyon (southwest), Northwest Territories, scale 1:100,000",
        "authors": "Fallas, K.M. and MacNaughton, R.B.",
        "ref_year": "2014",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 97",
        "isbn_doi": "doi: 10.4095/292289",
        "scale": "large",
        "features": 380,
        "area": 2703
      },
      {
        "source_id": 254,
        "name": "NW Norman Wells, NWT",
        "url": "https://doi.org/10.4095/292290",
        "ref_title": "Geology, Norman Wells (northwest), Northwest Territories, scale 1:100,000",
        "authors": "Fallas, K.M.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 98",
        "isbn_doi": "doi: 10.4095/292290",
        "scale": "large",
        "features": 92,
        "area": 2556
      },
      {
        "source_id": 110,
        "name": "Hasty, AR",
        "url": "https://pubs.usgs.gov/sim/2004/2847/",
        "ref_title": "Geologic Map of the Hasty Quadrangle, Boone and Newton Counties, Arkansas",
        "authors": "Hudson, M.R., and K.E. Murray",
        "ref_year": "2004",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 2847",
        "isbn_doi": "",
        "scale": "large",
        "features": 220,
        "area": 156
      },
      {
        "source_id": 79,
        "name": "Westwater, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Westwater 30′ x 60′ quadrangle, Grand and Uintah Counties, Utah and Garfield and Mesa Counties, Colorado",
        "authors": "Gualtieri, J.L.",
        "ref_year": "1988",
        "ref_source": "U.S. Geological Survey Miscellaneous Investigations Map I-1765",
        "isbn_doi": "",
        "scale": "large",
        "features": 817,
        "area": 4792
      },
      {
        "source_id": 62,
        "name": "Manti, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Manti 30′ x 60′ quadrangle, Carbon, Emery, Juab, Sanpete, and Sevier Counties, Utah",
        "authors": "Witkind, I.J, M.P. Weiss, T.L. Brown",
        "ref_year": "2006",
        "ref_source": "Utah Geological Survey Map 212DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 2544,
        "area": 4792
      },
      {
        "source_id": 27,
        "name": "Kanab, UT",
        "url": "http://geology.utah.gov/map-pub/maps/geologic-maps/30x60-minute-quadrangle/",
        "ref_title": "Geologic map of the Kanab 30'x60' quadrangle",
        "authors": "Doelling, H.H. (compiler)",
        "ref_year": "2008",
        "ref_source": "Utah Geological Survey Miscellaneous",
        "isbn_doi": "",
        "scale": "large",
        "features": 4903,
        "area": 4923
      },
      {
        "source_id": 56,
        "name": "Vernal, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Vernal 30′ x 60′ quadrangle, Uintah and Duchesne Counties, Utah, and Moffat and Rio Blanco, Colorado",
        "authors": "Sprinkel, D.H.",
        "ref_year": "2007",
        "ref_source": "Utah Geological Survey Open-File-Report 506DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 2324,
        "area": 4724
      },
      {
        "source_id": 57,
        "name": "Wah Wah Mountains, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic Map of Millard County | Geologic Map of the Wah Wah Mountains North 30' x 60' Quadrangle and Part of the Garrison 30' x 60' Quadrangle, Southwest Millard County and Part of Beaver County, Utah",
        "authors": "Hintze, L.F. and F.D. Davis",
        "ref_year": "2002",
        "ref_source": "Utah Geological Survey Map 207DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 7649,
        "area": 5061
      },
      {
        "source_id": 109,
        "name": "Devils Tower",
        "url": "http://www.wsgs.wyo.gov",
        "ref_title": "Preliminary Geologic Map of the Devils Tower 30'x60' Quadrangle.",
        "authors": "Sutherland, W.M.",
        "ref_year": "2008",
        "ref_source": "Wyoming State Geological Survey Open File Report 2007-06",
        "isbn_doi": "",
        "scale": "large",
        "features": 1453,
        "area": 4400
      },
      {
        "source_id": 60,
        "name": "Tule Valley, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Tule Valley 30′ x 60′ quadrangle and parts of the Ely, Fish Springs, and Kern Mountains 30′ x 60′ quadrangles, northwest Millard County, Utah",
        "authors": "Hintze, L.F. and F.D. Davis.",
        "ref_year": "2002",
        "ref_source": "Utah Geological Survey Map 186",
        "isbn_doi": "",
        "scale": "large",
        "features": 7962,
        "area": 5525
      },
      {
        "source_id": 158,
        "name": "Douglas, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-douglas-30-x-60-quadrangle-converse-and-platte-counties-wyoming-2008/",
        "ref_title": "Geologic Map Of The Douglas 30' X 60' Quadrangle, Converse And Platte Counties, Wyoming",
        "authors": "McLaughlin, J.F. and A.J. Ver Ploeg",
        "ref_year": "2008",
        "ref_source": "Wyoming State Geological Survey Map Series 83",
        "isbn_doi": "",
        "scale": "large",
        "features": 957,
        "area": 4548
      },
      {
        "source_id": 61,
        "name": "Provo, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the Provo 30′ x 60′ quadrangle, Utah, Wasatch, and Salt Lake Counties, Utah",
        "authors": "Constenius, K.N., Clark, D.L., King, J.K., and Ehler, J.B.",
        "ref_year": "2011",
        "ref_source": "Utah Geological Survey Open-File Report 586DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 9209,
        "area": 4724
      },
      {
        "source_id": 136,
        "name": "Lake Tahoe",
        "url": "http://www.quake.ca.gov/gmaps/rgm/tahoe/tahoe.html",
        "ref_title": "Geologic Map of the Lake Tahoe Basin, California and Nevada",
        "authors": "Saucedo, G.J. digitized by J.D. Little, S.E. Watkins, J.R. Davis, M.T. Mascorro, V.D. Walker, E.W. Ford",
        "ref_year": "2005",
        "ref_source": "California Department of Conservation California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 4634,
        "area": 2705
      },
      {
        "source_id": 65,
        "name": "Dutch John, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the Dutch John 30′ x 60′ quadrangle, Daggett and Uintah Counties, Utah, Moffat County, Colorado, and Sweetwater County, Wyoming",
        "authors": "Sprinkel, D.A.",
        "ref_year": "2006",
        "ref_source": "Utah Geological Survey Open-File-Report 491DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 3054,
        "area": 4689
      },
      {
        "source_id": 187,
        "name": "Recluse Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-recluse-30-x-60-quadrangle-campbell-and-crook-counties-wyoming-and-southeastern-montana-2002/",
        "ref_title": "Geologic Map Of The Recluse 30' X 60' Quadrangle, Campbell And Crook Counties, Wyoming, And Southeastern Montana",
        "authors": "Hallberg, L.L., R.M. Lyman, C.S. Boyd, R.W. Jones, A.J. Ver Ploeg",
        "ref_year": "2002",
        "ref_source": "Wyoming State Geological Survey Map Series 60",
        "isbn_doi": "",
        "scale": "large",
        "features": 1169,
        "area": 4400
      },
      {
        "source_id": 80,
        "name": "Price, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the Provo 30′ x 60′ quadrangle, Utah, Wasatch, and Salt Lake Counties, Utah",
        "authors": "Weiss, M.P., I.J. Witkind, W.B. Cashion",
        "ref_year": "1990",
        "ref_source": "Utah Geological Survey Open-File-Report 198DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 881,
        "area": 4758
      },
      {
        "source_id": 144,
        "name": "El Cajon, CA",
        "url": "https://pubs.usgs.gov/of/2004/1361/",
        "ref_title": "Preliminary Geologic Map of the El Cajon 30' x 60' Quadrangle, Southern California",
        "authors": "Todd, V.R.",
        "ref_year": "2004",
        "ref_source": "U.S. Geological Survey Open-File Report 2004-1361",
        "isbn_doi": "",
        "scale": "large",
        "features": 3415,
        "area": 4297
      },
      {
        "source_id": 161,
        "name": "Florissant Fossil Beds National Monument",
        "url": "https://irma.nps.gov/DataStore/Reference/Profile/1038954",
        "ref_title": "Unpublished Digital Geologic-GIS Map of Florissant Fossil Beds National Monument, Colorado (NPS, GRD, GRI, FLFO, FLFO digital map) adapted from a University of Colorado unpublished map map by Evanoff, Brill, de Toledo, Murphy, and Cushman (1992)",
        "authors": "Evanhoff, E.",
        "ref_year": "1992",
        "ref_source": "U.S. Department of the Interior National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 366,
        "area": 24
      },
      {
        "source_id": 105,
        "name": "Gauley River National Recreation Area",
        "url": "https://irma.nps.gov/DataStore/Reference/Profile/2166885",
        "ref_title": "Digital Bedrock Geologic Map of Gauley River National Recreation Area and Vicinity, West Virginia",
        "authors": "Hunt, Wilson, McColloch, McColloch and Gooding",
        "ref_year": "2010",
        "ref_source": "Adapted by National Patk Service from West Virginia Geological and Economic Survey Open File Map",
        "isbn_doi": "",
        "scale": "large",
        "features": 111,
        "area": 304
      },
      {
        "source_id": 93,
        "name": "North of San Francisco region",
        "url": "https://pubs.usgs.gov/mf/2002/2402/",
        "ref_title": "Geologic Map and Map Database of Western Sonoma, Northernmost Marin, and Southernmost Mendocino Counties, California",
        "authors": "Blake, M.C. Jr., R.W. Graymer, R.E. Stamski",
        "ref_year": "2002",
        "ref_source": "U.S. Geological Survey Miscellaneous Field Studies Map MF-2402",
        "isbn_doi": "",
        "scale": "large",
        "features": 2851,
        "area": 3598
      },
      {
        "source_id": 171,
        "name": "Sundance Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-sundance-30-x-60-quadrangle-crook-and-weston-counties-wyoming-and-lawrence-and-pennington-counties-south-dakota-2007/",
        "ref_title": "Geologic Map Of The Sundance 30' X 60' Quadrangle, Crook And Weston Counties, Wyoming, And Lawrence And Pennington Counties, South Dakota",
        "authors": "Sutherland, W.M.",
        "ref_year": "2007",
        "ref_source": "Wyoming State Geological Survey Map Series 78",
        "isbn_doi": "",
        "scale": "large",
        "features": 2041,
        "area": 4438
      },
      {
        "source_id": 117,
        "name": "Guam",
        "url": "http://north.hydroguam.net/gis_download.php",
        "ref_title": "Geologic map and sections of Guam, Mariana Islands",
        "authors": "Siegrist, H.G. Jr., M.K. Reagan, R.H. Randall, J.W. Jenson ",
        "ref_year": "2007",
        "ref_source": "Water & Environmental Research Institute at the University of Guam",
        "isbn_doi": "",
        "scale": "large",
        "features": 532,
        "area": 545
      },
      {
        "source_id": 175,
        "name": "Torrington Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-torrington-30-x-60-quadrangle-goshen-and-platte-counties-wyoming-and-scotts-bluff-and-sioux-counties-nebraska-2004/",
        "ref_title": "Geologic Map Of The Torrington 30’ X 60’ Quadrangle, Goshen And Platte Counties, Wyoming, And Scotts Bluff And Sioux Counties, Nebraska",
        "authors": "McLaughlin, J.F., and R.E. Harris",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Open File Report 04-11",
        "isbn_doi": "",
        "scale": "large",
        "features": 2257,
        "area": 4583
      },
      {
        "source_id": 229,
        "name": "Spray Lakes Reservoir, AB/BC",
        "url": "https://doi.org/10.4095/288954",
        "ref_title": "Geology, Spray Lakes Reservoir, Alberta–British Columbia, scale 1:50,000",
        "authors": "McMechan, M.E.",
        "ref_year": "2012",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 14",
        "isbn_doi": "doi: 10.4095/288954",
        "scale": "large",
        "features": 400,
        "area": 979
      },
      {
        "source_id": 75,
        "name": "Littlefield, AZ",
        "url": "http://pubs.usgs.gov/imap/i2628/",
        "ref_title": "Geologic Map of the Littlefield 30' x 60' Quadrangle, Mohave County, Northwestern Arizona",
        "authors": "Billingsly, G.H., J.B. Workman",
        "ref_year": "2001",
        "ref_source": "U.S. Geological Survey Geologic Investigations Map 2628",
        "isbn_doi": "",
        "scale": "large",
        "features": 13532,
        "area": 4955
      },
      {
        "source_id": 74,
        "name": "Peach Springs, AZ",
        "url": "http://pubs.usgs.gov/sim/2006/2900/",
        "ref_title": "Geologic Map of the Peach Springs 30’ x 60’ Quadrangle, Mohave and Coconino Counties, Northwestern Arizona",
        "authors": "Billingsly, G.H., D.L. Block, H.C. Dyer",
        "ref_year": "2006",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 2900",
        "isbn_doi": "",
        "scale": "large",
        "features": 7042,
        "area": 5018
      },
      {
        "source_id": 40,
        "name": "Mount Trumbull, AZ",
        "url": "http://pubs.usgs.gov/imap/i2766/",
        "ref_title": "Geologic map of the Mount Trumbull 30' X 60' quadrangle, Mohave and Coconino Counties, northwestern Arizona",
        "authors": "Billingsley, G.H., and Wellmeyer, J.L.",
        "ref_year": "2003",
        "ref_source": "U.S. Geological Survey Geologic Investigations Series I-2766",
        "isbn_doi": "",
        "scale": "large",
        "features": 5453,
        "area": 4987
      },
      {
        "source_id": 45,
        "name": "Lissadell, Australia",
        "url": "http://www.ga.gov.au/metadata-gateway/metadata/record/gcat_a05f7892-b449-7506-e044-00144fdd4fa6/Geology+of+the+Lissadell",
        "ref_title": "Geology of the Lissadell",
        "authors": "Plumb, K.A.",
        "ref_year": "2000",
        "ref_source": "Commonwealth of Australia (Geoscience Australia)",
        "isbn_doi": "",
        "scale": "large",
        "features": 2069,
        "area": 17722
      },
      {
        "source_id": 33,
        "name": "Great Smoky Mountains National Park",
        "url": "http://pubs.usgs.gov/of/2005/1225/",
        "ref_title": "Geologic Map of the Great Smoky Mountains National Park Region, Tennessee and North Carolina",
        "authors": "Southworth, S., A. Schultz, D. Denenny",
        "ref_year": "2005",
        "ref_source": "USGS Open-File Report 2005-1225",
        "isbn_doi": "",
        "scale": "large",
        "features": 8358,
        "area": 5806
      },
      {
        "source_id": 172,
        "name": "Nowater Creek Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-nowater-creek-30-x-60-quadrangle-northcentral-wyoming-2004/",
        "ref_title": "Geologic Map Of The Nowater Creek 30' X 60' Quadrangle, Northcentral Wyoming",
        "authors": "Ver Ploeg, A.J.",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Map Series 39",
        "isbn_doi": "",
        "scale": "large",
        "features": 1106,
        "area": 4474
      },
      {
        "source_id": 173,
        "name": "Latir Volcanic Field, NM",
        "url": "https://pubs.usgs.gov/imap/i-1907/",
        "ref_title": "Geologic Map of the Latir Volcanic Field and Adjacent Areas, Northern New Mexico",
        "authors": "Lipman, P.W., J.C. Reed, Jr.",
        "ref_year": "1989",
        "ref_source": "U.S. Geological Survey Miscellaneous Investigations Series Map I-1907",
        "isbn_doi": "",
        "scale": "large",
        "features": 6415,
        "area": 1383
      },
      {
        "source_id": 180,
        "name": "Ontario Paleozoic",
        "url": "http://www.geologyontario.mndm.gov.on.ca/mndmaccess/mndm_dir.asp?type=pub&id=MRD219",
        "ref_title": "Paleozoic geology of southern Ontario",
        "authors": "Armstrong, D.K, and J.E.P. Dodge",
        "ref_year": "2007",
        "ref_source": "Ontario Geological Survey Miscellaneous Release–Data 219",
        "isbn_doi": "",
        "scale": "large",
        "features": 1353,
        "area": 97918
      },
      {
        "source_id": 207,
        "name": "Nuremberg, Germany",
        "url": "https://www.bgr.bund.de/DE/Themen/Sammlungen-Grundlagen/GG_geol_Info/Karten/Deutschland/GUEK200/Texte/Nuernberg.html;jsessionid=D8873CEC0E5B537ADE40800C9B88215B.1_cid331?nn=1840614",
        "ref_title": "Geologische Übersichtskarte der Bundesrepublik Deutschland 1:200.000\n(GÜK200) - CC 7126 Nürnberg",
        "authors": "Vinnemann, C.",
        "ref_year": "2007",
        "ref_source": "Bundesanstalt für Geowissenschaften und Rohstoffe",
        "isbn_doi": "",
        "scale": "large",
        "features": 4122,
        "area": 8643
      },
      {
        "source_id": 72,
        "name": "Central California Coast Ranges",
        "url": "http://pubs.usgs.gov/sim/3287/",
        "ref_title": "Geologic and Geophysical Maps of the Eastern Three-Fourths of the Cambria 30´ x 60´ Quadrangle, Central California Coast Ranges",
        "authors": "Graymer, R.W., V.E. Langenheim, M.A. Roberts, K. McDougall",
        "ref_year": "2014",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3287",
        "isbn_doi": "doi: 10.3133/sim3287",
        "scale": "large",
        "features": 2115,
        "area": 1534
      },
      {
        "source_id": 85,
        "name": "Las Vegas, NV",
        "url": "http://pubs.usgs.gov/sim/2005/2814/",
        "ref_title": "Geologic and Geophysical maps of the Las Vegas 30' X 60' Quadrangle, Clark and Nye Counties, Nevada, and Inyo County, California",
        "authors": "Page, W.R., S.C. Lundstrom, A.G. Harris, V.E. Langenheim, J.B. Workman, S.A. Mahan, J.B. Paces, G.L. Dixon, P.D. Rowley, B.C. Burchfiel, J.W. Bell, E.I. Smith",
        "ref_year": "2005",
        "ref_source": "USGS Scientific Investigations Map 2814",
        "isbn_doi": "",
        "scale": "large",
        "features": 6256,
        "area": 4987
      },
      {
        "source_id": 69,
        "name": "Mid-Atlantic bedrock",
        "url": "http://pubs.usgs.gov/of/2001/of01-227/",
        "ref_title": "Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg",
        "authors": "Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler",
        "ref_year": "2001",
        "ref_source": "U.S. Geological Survey Open-File Report 01-227",
        "isbn_doi": "",
        "scale": "large",
        "features": 5305,
        "area": 13161
      },
      {
        "source_id": 245,
        "name": "Lawrence Co., IN",
        "url": "https://igws.indiana.edu/bookstore/details.cfm?Pub_Num=DI20",
        "ref_title": "Combined 7.5-minute quadrangle bedrock and unconsolidated geologic maps of Lawrence County, Indiana, scale (1:48,000)",
        "authors": "Keith, B. D., Thompson, T. A., Herrmann, E. W., Rupp, R. F., Hasenmueller, W. A., and Johnson, M. R.",
        "ref_year": "2014",
        "ref_source": "Indiana Geological and Water Survey Digital Information 20",
        "isbn_doi": "",
        "scale": "large",
        "features": 1756,
        "area": 1808
      },
      {
        "source_id": 39,
        "name": "Santa Cruz, CA",
        "url": "http://pubs.usgs.gov/of/1997/of97-489/",
        "ref_title": "Geologic map of Santa Cruz County, CA: a digital database",
        "authors": "Brabb, E.E. (compiler), S. Graham, C. Wentworth, D. Knifong, R. Graymer and J. Blissenbach (digitizers)",
        "ref_year": "1997",
        "ref_source": "U.S. Geological Survey Open-File Report 97-489",
        "isbn_doi": "",
        "scale": "large",
        "features": 1256,
        "area": 1742
      },
      {
        "source_id": 34,
        "name": "Grand Canyon, AZ",
        "url": "http://pubs.usgs.gov/imap/i-2688/",
        "ref_title": "Geologic Map of the Grand Canyon 30' x 60' Quadrangle, Coconino and Mohave Counties, Northwestern Arizona",
        "authors": "Billingsley, G.H.",
        "ref_year": "2000",
        "ref_source": "USGS Geologic Investigations Series I-2688",
        "isbn_doi": "",
        "scale": "large",
        "features": 3931,
        "area": 4987
      },
      {
        "source_id": 90,
        "name": "San Mateo County, CA",
        "url": "http://pubs.usgs.gov/of/1998/of98-137/",
        "ref_title": "Geology of the onshore part of San Mateo County, California",
        "authors": "Brabb, E.E., R.W. Graymer, D.L. Jones",
        "ref_year": "1998",
        "ref_source": "U.S. Geological Survey Open-File Report 98-137",
        "isbn_doi": "",
        "scale": "large",
        "features": 3805,
        "area": 1176
      },
      {
        "source_id": 30,
        "name": "Moab, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Moab and eastern part of the San Rafael Desert 30x60 Quad.",
        "authors": "Doelling, H.H.",
        "ref_year": "2002",
        "ref_source": "Utah Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 8166,
        "area": 5446
      },
      {
        "source_id": 32,
        "name": "St. George, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the St. George and East Part of the Clover Mountains Quadrangles, Wasington, and Iron Cos, UT",
        "authors": "Biek, R.F, P.D. Rowley, D.B. Hacker, J.M. Hayden et al.",
        "ref_year": "2010",
        "ref_source": "Utah Geological Survey Map 242DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 9259,
        "area": 5174
      },
      {
        "source_id": 102,
        "name": "Cuyama, CA",
        "url": "https://pubs.usgs.gov/sim/3002/",
        "ref_title": "Geologic Map of the Eastern Three-Quarters of the Cuyama 30’ x 60’ Quadrangle, California",
        "authors": "Kellogg, K.S., S.A. Minor, P.M. Cossette",
        "ref_year": "2008",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3002",
        "isbn_doi": "",
        "scale": "large",
        "features": 7099,
        "area": 3809
      },
      {
        "source_id": 246,
        "name": "Sunneshine Fiord, NU",
        "url": "https://doi.org/10.4095/288931",
        "ref_title": "Geology, Sunneshine Fiord, Baffin Island, Nunavut, scale 1:100,000 (preliminary)",
        "authors": "Sanborn-Barrie, M., Young, M., Keim, R. and Hamilton, B.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 6",
        "isbn_doi": "doi: 10.4095/288931",
        "scale": "large",
        "features": 122,
        "area": 4922
      },
      {
        "source_id": 99,
        "name": "Prescott National Forest, AZ",
        "url": "https://ngmdb.usgs.gov/Prodesc/proddesc_84409.htm",
        "ref_title": "Geologic map of the Prescott National Forest and the headwaters of the Verde River, Yavapai and Coconino Counties, Arizona",
        "authors": "DeWitt, E., V. Langenheim, E. Force, R.K. Vance, P.A. Lindberg, R.L. Driscoll",
        "ref_year": "2008",
        "ref_source": "Scientific Investigations Map SIM-2996",
        "isbn_doi": "",
        "scale": "large",
        "features": 5611,
        "area": 11135
      },
      {
        "source_id": 87,
        "name": "Big Bend National Park",
        "url": "http://pubs.usgs.gov/sim/3142/",
        "ref_title": "Geologic Map of Big Bend National Park, Texas",
        "authors": "Tuner, K.J. et al.",
        "ref_year": "2011",
        "ref_source": "Scientific Investigations Map 3142",
        "isbn_doi": "",
        "scale": "large",
        "features": 11605,
        "area": 3320
      },
      {
        "source_id": 124,
        "name": "Redwood County, MN",
        "url": "http://conservancy.umn.edu/handle/11299/182069",
        "ref_title": "Geologic Atlas of Redwood County, Minnesota",
        "authors": "Setterholm, D.R.",
        "ref_year": "2106",
        "ref_source": "Minnesota Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 1856,
        "area": 2288
      },
      {
        "source_id": 42,
        "name": "San Bernadino and Santa Ana, CA",
        "url": "http://pubs.usgs.gov/of/2006/1217/",
        "ref_title": "Geologic Map of the San Bernardino and Santa Ana 30' x 60' quadrangles, California",
        "authors": "Morton, D.M., F.K. Miller ",
        "ref_year": "2006",
        "ref_source": "U.S. Geological Survey Open-File Report 2006-1217",
        "isbn_doi": "",
        "scale": "large",
        "features": 35537,
        "area": 10021
      },
      {
        "source_id": 19,
        "name": "Washington",
        "url": "https://fortress.wa.gov/dnr/protectiongis/geology/",
        "ref_title": "Washington Interactive Geologic Map: 1:100,000 scale",
        "authors": "Washington State Department of Natural Resources, Division of Geology and Earth Resources",
        "ref_year": "2010",
        "ref_source": "Washington Division of Geology and Earth Resources",
        "isbn_doi": "",
        "scale": "large",
        "features": 57658,
        "area": 187943
      },
      {
        "source_id": 135,
        "name": "Marathon County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/000295/",
        "ref_title": "Precambrian Geology of Marathon County, Wisconsin",
        "authors": "LaBerge, G.L., and P.E. Myers",
        "ref_year": "1983",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 444,
        "area": 4082
      },
      {
        "source_id": 178,
        "name": "Albuquerque Quad, NM",
        "url": "https://pubs.usgs.gov/sim/2007/2946/",
        "ref_title": "Geologic map of the Albuquerque 30’ x 60’ quadrangle, north-central New Mexico",
        "authors": "Williams, P.L., J.C. Cole",
        "ref_year": "2007",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 2946",
        "isbn_doi": "",
        "scale": "large",
        "features": 3517,
        "area": 5048
      },
      {
        "source_id": 227,
        "name": "Mount Assiniboine, BC/AB",
        "url": "https://doi.org/10.4095/287204",
        "ref_title": "Geology, Mount Assiniboine, British Columbia–Alberta, scale 1:50,000",
        "authors": "McMechan, M.E. and G.B. Leech",
        "ref_year": "2011",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 13",
        "isbn_doi": "doi: 10.4095/287204",
        "scale": "large",
        "features": 252,
        "area": 979
      },
      {
        "source_id": 236,
        "name": "Nippers Harbour",
        "url": "https://doi.org/10.4095/295866",
        "ref_title": "Geology, Nippers Harbour and parts of Horse Islands, Cape St. John, and Little Bay Island, Newfoundland and Labrador, NTS 2-E/13 and parts of NTS 2-E/12, NTS 2-E/14, and NTS 2-L/4",
        "authors": "Skulski, T., S. Castonguay, Y. Moussallam, V.J. McNicoll, C.R. van Staal, J.H. Bédard",
        "ref_year": "2015",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 160",
        "isbn_doi": "doi: 10.4095/295866 ",
        "scale": "large",
        "features": 414,
        "area": 649
      },
      {
        "source_id": 58,
        "name": "Smoky Mountain, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic Map of the Smoky Mountain 30' x 60' Quadrangle, Kane and San Juan",
        "authors": "Doelling, H.H. and G.C. Willis",
        "ref_year": "2006",
        "ref_source": "Utah Geological Survey Map 213DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 4119,
        "area": 4923
      },
      {
        "source_id": 244,
        "name": "Takiyuaqattak, NWT",
        "url": "https://doi.org/10.4095/293344",
        "ref_title": "Geology, Takiyuaqattak, Victoria Island, Northwest Territories (preliminary), scale 1:50,000",
        "authors": "Rainbird, R.H., J.H. Bédard, and N. Williamson",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 104",
        "isbn_doi": "doi: 10.4095/293344",
        "scale": "large",
        "features": 157,
        "area": 1008
      },
      {
        "source_id": 237,
        "name": "Baie Verte, Newfoundland",
        "url": "https://doi.org/10.4095/295865 ",
        "ref_title": "Geology, Baie Verte and parts of Fleur de Lys, Newfoundland and Labrador, NTS 12-H/16 and part of NTS 12-I/1",
        "authors": "Skulski, T., S. Castonguay, W.S.F. Kidd, V.J. McNicoll, C.R. van Staal, J.P. Hibbard",
        "ref_year": "2015",
        "ref_source": "Canadian Geoscience Map 159",
        "isbn_doi": "doi: 10.4095/295865 ",
        "scale": "large",
        "features": 653,
        "area": 1151
      },
      {
        "source_id": 258,
        "name": "Grafton Co., NH",
        "url": "https://doi.org/10.3133/ofr20181016",
        "ref_title": "Bedrock geologic map of the Lisbon quadrangle, and parts of the Sugar Hill and East Haverhill quadrangles, Grafton County,\nNew Hampshire",
        "authors": "Rankin, D.W.",
        "ref_year": "2018",
        "ref_source": "United States Geological Survey Open-File Report 2018-1016",
        "isbn_doi": "\ndoi: 10.3133/ofr20181016",
        "scale": "large",
        "features": 230,
        "area": 187
      },
      {
        "source_id": 159,
        "name": "Evanston, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-evanston-30-x-60-quadrangle-uinta-and-sweetwater-counties-wyoming-2004/",
        "ref_title": "Geologic Map Of The Evanston 30’ X 60’ Quadrangle, Uinta And Sweetwater Counties, Wyoming",
        "authors": "Dover, J.H., and J.W. M'Gonigle",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Open Fille Report 04-6",
        "isbn_doi": "",
        "scale": "large",
        "features": 2889,
        "area": 4734
      },
      {
        "source_id": 228,
        "name": "Kanajuqtuuq (Paquet Bay), NU",
        "url": "https://doi.org/10.4095/306584",
        "ref_title": "Bedrock geology, Kanajuqtuuq (Paquet Bay), Nunavut, NTS 37-G north, scale 1:100,000",
        "authors": "Saumur, B.M., D.R. Skipton, M.R. St-Onge, N. Wodicka, E.R. Bros, O.M. Weller",
        "ref_year": "2018",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 349",
        "isbn_doi": "doi: 10.4095/306584",
        "scale": "large",
        "features": 140,
        "area": 8277
      },
      {
        "source_id": 123,
        "name": "Winona County, MN",
        "url": "http://conservancy.umn.edu/handle/11299/164935",
        "ref_title": "Geologic Atlas of Winona County, Minnesota",
        "authors": "Setterholm, D.R.",
        "ref_year": "2014",
        "ref_source": "Minnesota Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 470,
        "area": 1661
      },
      {
        "source_id": 192,
        "name": "Bill Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-bill-30-x-60-quadrangle-converse-campbell-and-weston-counties-wyoming-2007/",
        "ref_title": "Geologic map of the Bill 30' x 60' quadrangle, Converse, Campbell, and Weston counties, Wyoming",
        "authors": "Gregory, R.W., and D.C. Micale",
        "ref_year": "2007",
        "ref_source": "Wyoming State Geological Survey Map Series 72",
        "isbn_doi": "",
        "scale": "large",
        "features": 415,
        "area": 4511
      },
      {
        "source_id": 156,
        "name": "Fredonia, AZ",
        "url": "https://pubs.usgs.gov/sim/3035/",
        "ref_title": "Geologic Map of the Fredonia 30’ x 60’ Quadrangle, Mohave and Coconino Counties, Northern Arizona",
        "authors": "Billingsley, G.H., S.S. Priest, T.J. Felger",
        "ref_year": "2008",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3035",
        "isbn_doi": "",
        "scale": "large",
        "features": 14659,
        "area": 4955
      },
      {
        "source_id": 289,
        "name": "Mooresville West, IN",
        "url": "https://igws.indiana.edu/Bedrock",
        "ref_title": "Preliminary Map Showing Bedrock Geology of the Mooresville West 7.5-Minute Quadrangle, Indiana",
        "authors": "Rupp, R. F., McLaughlin, P. L., Bancroft, A.M., Hasenmueller, W. A., and Johnson, M.R.",
        "ref_year": "2017",
        "ref_source": "Indiana Geological Survey Open-File Study 17-03",
        "isbn_doi": "",
        "scale": "large",
        "features": 9,
        "area": 149
      },
      {
        "source_id": 287,
        "name": "Cobham Lake, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/9",
        "ref_title": "Cobham Lake 1:100 000 Geological Sheet 7337, Second edition",
        "authors": "Mills K.J., J.A Ogerman, and T.R. Sharp",
        "ref_year": "2010",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 1672,
        "area": 2667
      },
      {
        "source_id": 78,
        "name": "Sauk County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/download_ic67di/",
        "ref_title": "Geology of Sauk County, Wisconsin",
        "authors": "Clayton, L., Attig, J.W.",
        "ref_year": "2003",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 1416,
        "area": 2195
      },
      {
        "source_id": 262,
        "name": "Ogden, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the Ogden 30′ x 60′ quadrangle, Box Elder, Cache, Davis, Morgan, Rich, and Summit Counties, Utah, and Uinta County, Wyoming",
        "authors": "Coogan,J.C., and J.K. King",
        "ref_year": "2016",
        "ref_source": "Utah Geological Survey Open-File Report 653DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 21951,
        "area": 4654
      },
      {
        "source_id": 240,
        "name": "S. Irvine Inlet, NU",
        "url": "https://doi.org/10.4095/297795",
        "ref_title": "Geology, Irvine Inlet (south), Baffin Island, Nunavut (preliminary)",
        "authors": "St-Onge, M.R., Weller, O.M., Dyck, B.J., Rayner, N.M., Chadwick T., and Liikane, D.",
        "ref_year": "2016",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 262E, Canada-Nunavut Geoscience Office, Open File Map 2016-19E",
        "isbn_doi": "doi: 10.4095/297795",
        "scale": "large",
        "features": 83,
        "area": 7853
      },
      {
        "source_id": 271,
        "name": "S. Ellef Ringnes Island, NU",
        "url": "https://doi.org/10.4095/291566",
        "ref_title": "Geology, Ellef Ringnes Island south, Nunavut (preliminary)",
        "authors": "Evenchick, C.A., A.F. Embry",
        "ref_year": "2012",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 87",
        "isbn_doi": "doi: 10.4095/291566",
        "scale": "large",
        "features": 762,
        "area": 12187
      },
      {
        "source_id": 230,
        "name": "Campbell Lake, NWT",
        "url": "https://doi.org/10.4095/298807",
        "ref_title": "Bedrock geology, Campbell Lake, Northwest Territories (preliminary), scale 1:50,000",
        "authors": "Cecile, M.P., L.S. Lane, L.D. Dyke, D.K. Norris",
        "ref_year": "2017",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 179",
        "isbn_doi": "doi: 10.4095/298807",
        "scale": "large",
        "features": 26,
        "area": 1160
      },
      {
        "source_id": 100,
        "name": "La Crosse County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/000125/",
        "ref_title": "Geology of La Crosse County, Wisconsin",
        "authors": "Evans, T.J.",
        "ref_year": "2003",
        "ref_source": "Wisconsin Geological and Natural History Survey Bulletin B101-DI ",
        "isbn_doi": "",
        "scale": "large",
        "features": 485,
        "area": 1254
      },
      {
        "source_id": 116,
        "name": "Long Beach, CA",
        "url": "http://www.conservation.ca.gov/cgs/rghm/rgm/Pages/preliminary_geologic_maps.aspx",
        "ref_title": "Geologic Map of the Long Beach 30’ x 60’ Quadrangle, California",
        "authors": "Saucedo, G.J., H.G. Greene, M.P. Kennedy, S.P. Bezore",
        "ref_year": "2016",
        "ref_source": "Department of Conservation, California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 2274,
        "area": 5139
      },
      {
        "source_id": 264,
        "name": "South Chidliak Bay, NU",
        "url": "https://doi.org/10.4095/297357",
        "ref_title": "Geology, Chidliak Bay (south), Baffin Island, Nunavut, NTS 26-B (south, preliminary)",
        "authors": "Steenkamp, H.M., Gilbert, C., and St-Onge, M.R.",
        "ref_year": "2016",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 272",
        "isbn_doi": "doi: 10.4095/297357",
        "scale": "large",
        "features": 102,
        "area": 5406
      },
      {
        "source_id": 25,
        "name": "Northern Rockies",
        "url": "http://pubs.usgs.gov/of/2005/1235/",
        "ref_title": "Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington",
        "authors": "Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al.",
        "ref_year": "2005",
        "ref_source": "U.S. Geological Survey Open-File Report 2005-1235 Version 1.0",
        "isbn_doi": "",
        "scale": "large",
        "features": 80327,
        "area": 255160
      },
      {
        "source_id": 17,
        "name": "Iowa County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/wofr201001di/",
        "ref_title": "GIS Data Accompanying WOFR2010-01: Preliminary Geology of Iowa County, Wisconsin",
        "authors": "Wisconsin Geologic and Natural History Survey",
        "ref_year": "2010",
        "ref_source": "Wisconsin Geologic and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 601,
        "area": 1989
      },
      {
        "source_id": 234,
        "name": "Kananaskis Lakes, BC/AB",
        "url": "https://doi.org/10.4095/288953",
        "ref_title": "Geology, Kananaskis lakes, British Columbia–Alberta, scale 1:50,000",
        "authors": "McMechan, M.E.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 11",
        "isbn_doi": "doi: 10.4095/288953",
        "scale": "large",
        "features": 482,
        "area": 984
      },
      {
        "source_id": 106,
        "name": "Rock Springs, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-rock-springs-30-x-60-quadrangle-sweetwater-county-wyoming/",
        "ref_title": "Geologic Map Of The Rock Springs 30' X 60' Quadrangle, Sweetwater County, Wyoming",
        "authors": "Jones, R.W. and J.E. Scott",
        "ref_year": "2010",
        "ref_source": "Wyoming State Geological Survey Map Series, Open File Repot",
        "isbn_doi": "",
        "scale": "large",
        "features": 257,
        "area": 4643
      },
      {
        "source_id": 112,
        "name": "Los Angeles, CA",
        "url": "https://pubs.usgs.gov/of/2005/1019/",
        "ref_title": "Preliminary Geologic Map of the Los Angeles 30' x 60' Quadrangle, Southern California",
        "authors": "Alvarez, R.M. and K.R. Bovard",
        "ref_year": "2005",
        "ref_source": "U.S. Geological Survey Open-File Report 2005-1019",
        "isbn_doi": "",
        "scale": "large",
        "features": 7136,
        "area": 5109
      },
      {
        "source_id": 162,
        "name": "Ashland and Northern Ironwood 30' x 60' Quadrangles",
        "url": "https://pubs.usgs.gov/of/1999/of99-546/",
        "ref_title": "Digital Bedrock Geologic Map of the Ashland and Northern Part of the Ironwood 30' x 60' Quadrangles, Wisconsin and Michigan",
        "authors": "Cannon, W.F., L.G. Woodruff, S.W. Nicholson, C.A. Hedgman, and R.D. Barber-Delach",
        "ref_year": "1999",
        "ref_source": "U.S. Geological Survey Open-File Report 99-546",
        "isbn_doi": "",
        "scale": "large",
        "features": 132,
        "area": 3764
      },
      {
        "source_id": 127,
        "name": "Laramie, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-laramie-30-x-60-quadrangle-albany-and-laramie-counties-wyoming/",
        "ref_title": "Geologic Map Of The Laramie 30' X 60' Quadrangle, Albany And Laramie Counties, Wyoming",
        "authors": "Ver Ploeg, A.J. and C.S. Boyd",
        "ref_year": "2007",
        "ref_source": "Wyoming State Geological Survey Map Series 77, scale 1:100,000",
        "isbn_doi": "",
        "scale": "large",
        "features": 1996,
        "area": 4673
      },
      {
        "source_id": 257,
        "name": "Mumiksaa-Milne Inlet, NU",
        "url": "https://doi.org/10.4095/306579",
        "ref_title": "Bedrock geology, Mumiksaa–Milne Inlet, Nunavut, parts of NTS 38-B and 48-A, scale 1:100,000",
        "authors": "Saumur, B.M., Skipton, D.R., St-Onge, M.R., Wodicka, N., Bros, E.R., and Weller, O.M.",
        "ref_year": "2018",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 348",
        "isbn_doi": "doi: 10.4095/306579",
        "scale": "large",
        "features": 77,
        "area": 3306
      },
      {
        "source_id": 223,
        "name": "Myersville & Smithsburg, MD",
        "url": "http://www.mgs.md.gov/publications/data_pages/quadrangle_geo.html",
        "ref_title": "Geologic Map of the Myersville Quadrangle and Maryland portion of the Smithsburg Quadrangle, Washington and Frederick Counties, Maryland",
        "authors": "Brezinski, D.K. and J.L. Fauth",
        "ref_year": "2009",
        "ref_source": "Maryland Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 174,
        "area": 262
      },
      {
        "source_id": 84,
        "name": "Yosemite National Park",
        "url": "http://pubs.usgs.gov/imap/i1874/",
        "ref_title": "Geologic Map of Yosemite National Park and Vicinity, California: a digital database",
        "authors": "Huber, N.K., Bateman, P.C., Wahrhaftig, C.",
        "ref_year": "2003",
        "ref_source": "USGS Miscellaneous Investigations Series I-1874",
        "isbn_doi": "",
        "scale": "large",
        "features": 4830,
        "area": 5199
      },
      {
        "source_id": 155,
        "name": "Rattlesnake Hills, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-rattlesnake-hills-30-x-60-quadrangle-fremont-and-natrona-counties-wyoming-2003/",
        "ref_title": "Geologic Map Of The Rattlesnake Hills 30' X 60' Quadrangle, Fremont And Natrona Counties, Wyoming",
        "authors": "Sutherland, W., and W.D. Hausel",
        "ref_year": "2003",
        "ref_source": "Wyoming State Geological Survey Map Series 61",
        "isbn_doi": "",
        "scale": "large",
        "features": 1821,
        "area": 4548
      },
      {
        "source_id": 126,
        "name": "Oldonyo Lengai Volcano",
        "url": "https://pubs.usgs.gov/of/2013/1306/",
        "ref_title": "Geologic map of Oldonyo Lengai (Oldoinyo Lengai) and surroundings, Arusha Region, United Republic of Tanzania",
        "authors": "Sherrod, D.R., Magigita, M.M., and Kwelwa, S.",
        "ref_year": "2013",
        "ref_source": "U.S. Geological Survey Open-File Report 2013-1306",
        "isbn_doi": "doi: 10.3133/ofr20131306",
        "scale": "large",
        "features": 409,
        "area": 625
      },
      {
        "source_id": 247,
        "name": "Circle Lake, NU",
        "url": "https://doi.org/10.4095/288929",
        "ref_title": "Geology, Circle Lake, Baffin Island, Nunavut,  (preliminary), scale 1:100,000",
        "authors": "Sanborn-Barrie, M. and Young, M.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 5 ",
        "isbn_doi": "doi: 10.4095/288929",
        "scale": "large",
        "features": 131,
        "area": 5421
      },
      {
        "source_id": 15,
        "name": "East Salt Lake City, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the east half of the Salt Lake City quadrangle",
        "authors": "Bryant, B.",
        "ref_year": "2010",
        "ref_source": "U.S. Geological Survey Miscellaneous Investigations Series Map I-1997",
        "isbn_doi": "",
        "scale": "large",
        "features": 2768,
        "area": 9413
      },
      {
        "source_id": 131,
        "name": "Oceanside, CA",
        "url": "http://quake.ca.gov/gmaps/rgm/oceanside/oceanside.html",
        "ref_title": "Geologic Map of the Oceanside 30’ x 60’ Quadrangle, California",
        "authors": "Kennedy, M.P., and S.S. Tan. digital prep. by Bovard et al.",
        "ref_year": "2007",
        "ref_source": "California Department of Conservation California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 4903,
        "area": 5168
      },
      {
        "source_id": 132,
        "name": "Great Sand Dunes National Park",
        "url": "https://pubs.er.usgs.gov/publication/sim3362",
        "ref_title": "Geologic map of Great Sand Dunes National Park, Colorado",
        "authors": "Madole, R.F., D.P. VanSistine, J.H. Romig",
        "ref_year": "2016",
        "ref_source": "Scientific Investigations Map 3362",
        "isbn_doi": "doi: 10.3133/sim3362",
        "scale": "large",
        "features": 582,
        "area": 436
      },
      {
        "source_id": 141,
        "name": "Beatty, NV",
        "url": "https://pubs.usgs.gov/of/1996/of96-291/",
        "ref_title": "Digital Bedrock Geologic Map Database of the Beatty 30 X 60-Minute Quadrangle, Nevada and California",
        "authors": "Carr, M.D., D.A. Sawyer, K. Nimz, F. Maldonado, WC Swadley",
        "ref_year": "1996",
        "ref_source": "U.S. Geological Survey Open-File Report 96-291",
        "isbn_doi": "",
        "scale": "large",
        "features": 5994,
        "area": 4955
      },
      {
        "source_id": 189,
        "name": "Fernie, British Columbia",
        "url": "https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=292659",
        "ref_title": "Geology, Fernie, British Columbia–Alberta",
        "authors": "Price, R.A.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Map 2200A",
        "isbn_doi": "doi: 10.4095/292659",
        "scale": "large",
        "features": 962,
        "area": 16113
      },
      {
        "source_id": 250,
        "name": "Marion Co, IN",
        "url": "http://marioncounty.igs.indiana.edu/index.html",
        "ref_title": "A map of the bedrock geology of Marion County, Indiana",
        "authors": "Hasenmueller, W.A. and R.F. Rupp (compiler)",
        "ref_year": "2010",
        "ref_source": "Indiana Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 6,
        "area": 1044
      },
      {
        "source_id": 140,
        "name": "Catalunya 50k",
        "url": "http://www.icgc.cat/Administracio-i-empresa/Descarregues/Cartografia-geologica-i-geotematica/Cartografia-geologica/Mapa-geologic-comarcal-de-Catalunya-1-50.000",
        "ref_title": "Mapa geològic comarcal de Catalunya 1:50.000",
        "authors": "Institut Cartogràfic i Geològic de Catalunya",
        "ref_year": "2016",
        "ref_source": "Generalitat de Catalunya",
        "isbn_doi": "",
        "scale": "large",
        "features": 54918,
        "area": 32102
      },
      {
        "source_id": 98,
        "name": "Ponca, AR",
        "url": "https://pubs.usgs.gov/mf/2003/mf-2412/",
        "ref_title": "Geologic Map of the Ponca Quadrange, Newton, Boone, and Carroll Counties, Arkansas",
        "authors": "Hudson, M.R., K.E. Murray",
        "ref_year": "2003",
        "ref_source": "U.S. Geological Survey Miscellaneous Field Studies Map MF-2412",
        "isbn_doi": "",
        "scale": "large",
        "features": 405,
        "area": 156
      },
      {
        "source_id": 217,
        "name": "SE Carcajou Canyon, NWT",
        "url": "https://doi.org/10.4095/292288",
        "ref_title": "Geology, Carcajou Canyon (southeast), Northwest Territories, scale 1:100 000",
        "authors": "Fallas, K.M. and K.B. MacNaughton",
        "ref_year": "2014",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 96",
        "isbn_doi": "doi: 10.4095/292288",
        "scale": "large",
        "features": 232,
        "area": 2703
      },
      {
        "source_id": 151,
        "name": "Lake Mead",
        "url": "https://pubs.usgs.gov/of/2007/1010/",
        "ref_title": "Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona",
        "authors": "Beard, L.S., R.E. Anderson, D.L. Block, R.G. Bohannon, R.J. Brady, S.B. Castor, E.M. Duebendorfer, J.E. Faulds, T.J. Felger, K.A. Howard, M.A. Kuntz, and V.S. Williams",
        "ref_year": "2007",
        "ref_source": "U.S. Geological Survey \nOpen-File Report 2007-1010\nversion 1.0",
        "isbn_doi": "",
        "scale": "large",
        "features": 11201,
        "area": 4987
      },
      {
        "source_id": 31,
        "name": "La Sal, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the La Sal 30'x60'quadrangle, San Juan, Wayne, and Garfield Counties, Utah and Montrose and San Miguel Counties, Colorado",
        "authors": "Doelling, H.H.",
        "ref_year": "2006",
        "ref_source": "Utah Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 4643,
        "area": 4858
      },
      {
        "source_id": 218,
        "name": "Eight Mile Creek, BC",
        "url": "https://doi.org/10.4095/292046",
        "ref_title": "Geology, Eight Mile Creek, British Columbia; (preliminary), scale 1:50,000",
        "authors": "McMechan, M.E.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 102",
        "isbn_doi": "doi: 10.4095/292046",
        "scale": "large",
        "features": 89,
        "area": 797
      },
      {
        "source_id": 152,
        "name": "Casper, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-casper-30-x-60-quadrangle-natrona-and-converse-counties-central-wyoming-2005/",
        "ref_title": "Geologic Map of the Casper 30’ X 60’ Quadrangle, Natrona and Converse Counties, Central Wyoming",
        "authors": "Hunter, J., A.J. Ver Ploeg, C.S. Boyd",
        "ref_year": "2005",
        "ref_source": "Wyoming State Geological Survey Map Series 65",
        "isbn_doi": "",
        "scale": "large",
        "features": 917,
        "area": 4548
      },
      {
        "source_id": 153,
        "name": "St. Croix-Pierce Counties, WI",
        "url": "http://wgnhs.uwex.edu/pubs/wofr200708/",
        "ref_title": "Preliminary Geology of the Buried Bedrock Surface in St. Croix and Pierce Counties (harmonized digital versions). ",
        "authors": "LePain, D.L. (St.Croix); T.J. Evans, W.S. Cordua, D.L. LePain (Pierce)",
        "ref_year": "2007",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 167,
        "area": 3720
      },
      {
        "source_id": 97,
        "name": "Jasper, AR",
        "url": "https://pubs.usgs.gov/mf/2001/mf-2356/",
        "ref_title": "Geologic Map of the Jasper Quadrangle, Newton and Boone Counties, Arkansas",
        "authors": "Hudson, M.R., K.E. Murray, D. Pezzutti",
        "ref_year": "2001",
        "ref_source": "U.S. Geological Survey Miscellaneous Field Studies Map MF-2356",
        "isbn_doi": "",
        "scale": "large",
        "features": 373,
        "area": 156
      },
      {
        "source_id": 170,
        "name": "United States–Mexico Border Region",
        "url": "https://pubs.usgs.gov/of/2009/1015/",
        "ref_title": "Preliminary Geologic Map of the Laredo, Crystal City–Eagle Pass, San Antonio, and Del Rio 1° x 2° Quadrangles, Texas, and the Nuevo Laredo, Ciudad Acuña, Piedras Negras, and Nueva Rosita 1° x 2° Quadrangles, Mexico",
        "authors": "Page, W.R., M.E. Berry, D.P. VanSistine, S.R. Snyders",
        "ref_year": "2009",
        "ref_source": "U.S. Geological Survey Open-File Report 2009-1015",
        "isbn_doi": "",
        "scale": "large",
        "features": 7919,
        "area": 130190
      },
      {
        "source_id": 35,
        "name": "Denver West, CO",
        "url": "http://pubs.usgs.gov/sim/3000/",
        "ref_title": "Geologic Map of the Denver West 30' x 60' Quadrangle, North-\r\nCentral Colorado",
        "authors": "Kellogg, K.S., Shroba, R.R., Bryant, Bruce, and Premo, W.R.",
        "ref_year": "2008",
        "ref_source": "USGS Geologic Investigations Series 3000",
        "isbn_doi": "",
        "scale": "large",
        "features": 7115,
        "area": 4758
      },
      {
        "source_id": 37,
        "name": "Boulder, CO",
        "url": "http://pubs.usgs.gov/imap/855/G/",
        "ref_title": "Geologic Map of the Boulder-Fort Collins-Greeley area, Colorado\n",
        "authors": "Colton, Roger B.",
        "ref_year": "1976",
        "ref_source": "\nU.S. Geological Survey Geologic Investigations Series I-855-G",
        "isbn_doi": "",
        "scale": "large",
        "features": 4500,
        "area": 4425
      },
      {
        "source_id": 107,
        "name": "Sheboygan County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/000923/",
        "ref_title": "Preliminary Bedrock Geology of Sheboygan County, Wisconsin",
        "authors": "McLaughlin, P.I.",
        "ref_year": "2013",
        "ref_source": "Wisconsin Geologic and Natural History Survey WOFR2013-03",
        "isbn_doi": "",
        "scale": "large",
        "features": 23,
        "area": 1341
      },
      {
        "source_id": 182,
        "name": "Lance Creek Quad, WY",
        "url": "http://www.wsgs.wyo.gov/wyoming-geology/mapping",
        "ref_title": "Geologic Map Of The Lance Creek 30' X 60' Quadrangle, Niobrara And Converse Counties, Wyoming, Fall River And Custer Counties, South Dakota, And Sioux County, Nebraska",
        "authors": "Johnson, J.F., and D.C. Micale",
        "ref_year": "2008",
        "ref_source": "Wyoming State Geological Survey Map Series 79",
        "isbn_doi": "",
        "scale": "large",
        "features": 182,
        "area": 4511
      },
      {
        "source_id": 150,
        "name": "Juneau County, WI",
        "url": "https://wgnhs.uwex.edu/pubs/000316/",
        "ref_title": "Data Accompanying IC66: Geology of Juneau County, Wisconsin",
        "authors": "Attig, J.W., M.A. Muldoon",
        "ref_year": "1989",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 881,
        "area": 2083
      },
      {
        "source_id": 160,
        "name": "Carrizo Plain, CA",
        "url": "https://pubs.usgs.gov/of/1999/of99-014/",
        "ref_title": "Regional Geologic Map of San Andreas and Related Faults in Carrizo Plain, Temblor, Caliente and La Panza Ranges and Vicinity, California; A Digital Database",
        "authors": "Graham, S.E., T.M. Mahony, J.L. Blissenbach, J.J. Mariant, C.M. Wentworth",
        "ref_year": "1999",
        "ref_source": "U.S. Geological Survey Open-File Report 99-014",
        "isbn_doi": "",
        "scale": "large",
        "features": 2580,
        "area": 10293
      },
      {
        "source_id": 193,
        "name": "Lynndyl Quad, UT",
        "url": "https://www.utahmapstore.com/m211.html",
        "ref_title": "Geologic map of the Lynndyl 30′ x 60′ quadrangle, west-central Utah (digitized 2005)",
        "authors": "Pampeyan, E.H.",
        "ref_year": "1989",
        "ref_source": "Utah Geological Survey Miscellaneous Investigations Series Map I-1830",
        "isbn_doi": "",
        "scale": "large",
        "features": 4612,
        "area": 4758
      },
      {
        "source_id": 174,
        "name": "Rawlins Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/preliminary-geologic-map-of-the-rawlins-30-x-60-quadrangle-carbon-and-sweetwater-counties-southeastern-wyoming-2008/",
        "ref_title": "Preliminary Geologic Map Of The Rawlins 30' X 60' Quadrangle, Carbon And Sweetwater Counties, Southeastern Wyoming",
        "authors": "McLaughlin, J.F., and J. Fruhwirth",
        "ref_year": "2008",
        "ref_source": "Wyoming State Geological Survey Open File Report 08-4",
        "isbn_doi": "",
        "scale": "large",
        "features": 1059,
        "area": 4620
      },
      {
        "source_id": 288,
        "name": "Wonnaminta, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/12",
        "ref_title": "Wonnaminta 1:100 000 Geological Sheet 7336, 2nd Edition. ",
        "authors": "Mills K.G., Hicks M. G. and I.B. Cooper",
        "ref_year": "2015",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 2239,
        "area": 2654
      },
      {
        "source_id": 224,
        "name": "NE Toad River, BC",
        "url": "https://doi.org/10.4095/293264",
        "ref_title": "Geology, Toad River (northeast), British Columbia (preliminary)",
        "authors": "McMechan, M.E.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 150",
        "isbn_doi": "doi: 10.4095/293264",
        "scale": "large",
        "features": 69,
        "area": 3132
      },
      {
        "source_id": 225,
        "name": "Tangle Peak, BC",
        "url": "https://doi.org/10.4095/287454",
        "ref_title": "Geology, Tangle Peak, British Columbia; Geological Survey of Canada, scale 1:50,000",
        "authors": "McMechan, M.E. and G.B. Leech",
        "ref_year": "2011",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 12",
        "isbn_doi": "doi: 10.4095/287454",
        "scale": "large",
        "features": 191,
        "area": 984
      },
      {
        "source_id": 143,
        "name": "Brown County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/000896/",
        "ref_title": "Preliminary Geologic Map of the Buried Bedrock Surface, Brown County, Wisconsin",
        "authors": "Luczaj, J.A.",
        "ref_year": "2011",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 23,
        "area": 1592
      },
      {
        "source_id": 36,
        "name": "Precambrian geology of Albanel Township",
        "url": "http://www.geologyontario.mndmf.gov.on.ca/mndmaccess/mndm_dir.asp?type=pub&id=P3773",
        "ref_title": "Precambrian geology of Albanel Township, Southern and Superior Provinces",
        "authors": "Lewis, D.",
        "ref_year": "2013",
        "ref_source": "Ontario Geological Survey Preliminary Map P.3773",
        "isbn_doi": "",
        "scale": "large",
        "features": 136,
        "area": 94
      },
      {
        "source_id": 104,
        "name": "Southeast Wisconsin",
        "url": "http://wgnhs.uwex.edu/pubs/download_wofr200418/",
        "ref_title": "Preliminary Bedrock Geologic Map of Walworth, Racine, Kenosha, Milwaukee, Waukesha, Ozaukee, and Washington Counties",
        "authors": "Evans, T.J., K.M. Massie-Ferch, R.M. Peters",
        "ref_year": "2004",
        "ref_source": "Wisconsin Geologic and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 213,
        "area": 6967
      },
      {
        "source_id": 122,
        "name": "Houston County, MN",
        "url": "http://conservancy.umn.edu/handle/11299/164885",
        "ref_title": "Geologic Atlas of Houston County, Minnesota",
        "authors": "Setterholm, D.R.",
        "ref_year": "2014",
        "ref_source": "Minnesota Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 516,
        "area": 1473
      },
      {
        "source_id": 119,
        "name": "Hot Springs National Park",
        "url": "https://catalog.data.gov/dataset/unpublished-interim-digital-geologic-map-of-hot-springs-national-park-and-vicinity-arkansa-2011",
        "ref_title": "Unpublished Interim Digital Geologic Map of Hot Springs National Park and Vicinity, Arkansas, ",
        "authors": "Adapted from Arkansas Geological Survey Digital Geologic Quadrangle Map by Johnson and Hanson (2011)",
        "ref_year": "2011",
        "ref_source": "National Park Service Geologic Resources Inventory program",
        "isbn_doi": "",
        "scale": "large",
        "features": 178,
        "area": 637
      },
      {
        "source_id": 283,
        "name": "Cobbora Sheet, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/71",
        "ref_title": "Cobbora 1:100 000 Geological Sheet 8733, 1st edition",
        "authors": "Meakin N.S., Henderson G.A.M., Podgon D.J., Colqhoun G.P. and Barron L.",
        "ref_year": "2000",
        "ref_source": "Geological Survey of New South Wales, Sydney & Geoscience Australia, Canberra",
        "isbn_doi": "",
        "scale": "large",
        "features": 1134,
        "area": 2612
      },
      {
        "source_id": 260,
        "name": "Allen Co., IN",
        "url": "https://igws.indiana.edu/AllenCounty/bedrockGeology",
        "ref_title": "Digitized from: The hydrogeology of Allen County, Indiana - a geologic and ground-water atlas",
        "authors": "Fleming, A.H.",
        "ref_year": "1994",
        "ref_source": "Indiana Geological Survey Special Report 57",
        "isbn_doi": "",
        "scale": "large",
        "features": 32,
        "area": 1709
      },
      {
        "source_id": 251,
        "name": "Salt Lake City Quad, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Salt Lake City 30x60 Quadrangle, North-Central Utah, and Uinta County, Wyoming",
        "authors": "Bryant, B.",
        "ref_year": "1990",
        "ref_source": "Micellaneous Investigations Series Map I-1944",
        "isbn_doi": "",
        "scale": "large",
        "features": 4867,
        "area": 4689
      },
      {
        "source_id": 81,
        "name": "Panguitch, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Panguitch 30′ x 60′ quadrangle, Garfield, Iron, and Kane Counties, Utah",
        "authors": "Biek, R.F., P.D. Rowley, J.J. Anderson, F. Maldonado, D.W. Moore, D.B. Hacker, J.G. Eaton, R. Hereford, H.Filkorn, B. Matyjasik",
        "ref_year": "2015",
        "ref_source": "Utah Geological Survey Map 270DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 9081,
        "area": 4891
      },
      {
        "source_id": 115,
        "name": "San Diego, CA",
        "url": "http://www.quake.ca.gov/gmaps/rgm/sandiego/sandiego.html",
        "ref_title": "Geologic Map of the San Diego 30' x 60' Quadrangle, California",
        "authors": "Kennedy, M.P. and S.S. Tan",
        "ref_year": "2008",
        "ref_source": "Department of Conservation, California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 2769,
        "area": 5197
      },
      {
        "source_id": 286,
        "name": "Cobar, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/70",
        "ref_title": "Cobar 1:100 000 Geological Sheet 8035, 2nd edition",
        "authors": "Glen R.A.",
        "ref_year": "1994",
        "ref_source": "Geological Survey of New South Wales, Sydney",
        "isbn_doi": "",
        "scale": "large",
        "features": 2963,
        "area": 2662
      },
      {
        "source_id": 285,
        "name": "Sussex, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/134",
        "ref_title": "Sussex 1:100 000 Geological Sheet 8135, First edition",
        "authors": "Burton, G.R., Trigg, S.J. & Dawson, M.W.",
        "ref_year": "2012",
        "ref_source": "Geological Survey of New South Wales, Maitland, NSW",
        "isbn_doi": "",
        "scale": "large",
        "features": 2382,
        "area": 2640
      },
      {
        "source_id": 252,
        "name": "Pritzler Harbour, NU",
        "url": "https://doi.org/10.4095/296109",
        "ref_title": "Geology, Pritzler Harbour, Baffin Island, Nunavut (preliminary), scale 1:100,000",
        "authors": "St-Onge, M.R., Rayner, N.M., Steenkamp, H.M., and Gilbert, C.",
        "ref_year": "2015",
        "ref_source": "Canada-Nunavut Geoscience Office, Open File Map 2015-03E",
        "isbn_doi": "doi: 10.4095/296109",
        "scale": "large",
        "features": 230,
        "area": 3964
      },
      {
        "source_id": 130,
        "name": "Glouster and Rockport Quads, MA",
        "url": "https://mgs.geo.umass.edu/biblio/digital-conversion-bedrock-geologic-map-gloucester-and-rockport-quadrangles-massachusetts",
        "ref_title": "Bedrock geologic map of the Gloucester and Rockport quadrangles, Massachusetts",
        "authors": "Dennen, W.H.",
        "ref_year": "1992",
        "ref_source": "U.S. Geological Survey Miscellaneous Investigations Series Map I-2285. Digital Conversion 2007",
        "isbn_doi": "",
        "scale": "large",
        "features": 220,
        "area": 261
      },
      {
        "source_id": 197,
        "name": "Newcastle Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-newcastle-30-x-60-quadrangle-weston-and-niobrara-counties-wyoming-and-pennington-and-custer-counties-south-dakota-2006/",
        "ref_title": "Geologic map of the Newcastle 30' x 60' quadrangle, Weston and Niobrara counties, Wyoming, and Pennington and Custer counties, South Dakota",
        "authors": "McLaughlin, J.F., and A.J. Ver Ploeg",
        "ref_year": "2006",
        "ref_source": "Wyoming State Geological Survey Map Series 71",
        "isbn_doi": "",
        "scale": "large",
        "features": 1285,
        "area": 4475
      },
      {
        "source_id": 226,
        "name": "SE Toad River, BC",
        "url": "https://doi.org/10.4095/293693",
        "ref_title": "Geology, Toad River (southeast), British Columbia, scale 1:100,000 (preliminary)",
        "authors": "McMechan, M.E.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 149",
        "isbn_doi": "doi: 10.4095/293693",
        "scale": "large",
        "features": 68,
        "area": 3178
      },
      {
        "source_id": 239,
        "name": "Grayling River, BC",
        "url": "https://doi.org/10.4095/293156",
        "ref_title": "Geology, Grayling River, British Columbia (preliminary)",
        "authors": "McMechan, M.E.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 115",
        "isbn_doi": "doi: 10.4095/293156",
        "scale": "large",
        "features": 35,
        "area": 792
      },
      {
        "source_id": 238,
        "name": "King's Point, NL",
        "url": "https://doi.org/10.4095/295864",
        "ref_title": "Geology, King's Point, Newfoundland and Labrador, NTS 12-H/9",
        "authors": "Skulski, T., S. Castonguay, W.S.F. Kidd, V.J. McNicoll, and C.R. van Staal",
        "ref_year": "2015",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 156",
        "isbn_doi": "doi: 10.4095/295864",
        "scale": "large",
        "features": 339,
        "area": 678
      },
      {
        "source_id": 199,
        "name": "Lower Escalante River, UT",
        "url": "https://geology.utah.gov/map-pub/maps/gis/#tab-id-4",
        "ref_title": "Geologic map of the lower Escalante River area, Glen Canyon National Recreation Area, eastern Kane County, Utah",
        "authors": "Doelling, H.H., and G.C. Willis",
        "ref_year": "2007",
        "ref_source": "Utah Geological Survey Miscellaneous Publication 06-3DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 486,
        "area": 925
      },
      {
        "source_id": 201,
        "name": "Salina Quad, UT",
        "url": "https://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the east half of the Salina 30′ x 60′ quadrangle, Emery, Sevier, and Wayne Counties, Utah",
        "authors": "Doelling, H.H., and P.A. Kuchne",
        "ref_year": "2016",
        "ref_source": "Utah Geological Survey Open-File Report 642DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 10004,
        "area": 2413
      },
      {
        "source_id": 200,
        "name": "Winslow Quad, AZ",
        "url": "https://pubs.usgs.gov/sim/3247/",
        "ref_title": "Geologic map of the Winslow 30’ × 60’ quadrangle, Coconino and Navajo Counties, northern Arizona",
        "authors": "Billingsley, G.H., D. Block, and M. Hiza Redsteer",
        "ref_year": "2013",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3247",
        "isbn_doi": "",
        "scale": "large",
        "features": 32119,
        "area": 5049
      },
      {
        "source_id": 22,
        "name": "Kentucky",
        "url": "http://www.arcgis.com/home/item.html?id=7fdc8d3e83cf4a74ae2dda673de7cff0",
        "ref_title": "Kentucky 1:24,000 Geologic Map",
        "authors": "KGS Databases, Maps, and Publications",
        "ref_year": "2015",
        "ref_source": "Kentucky Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 217499,
        "area": 104634
      },
      {
        "source_id": 148,
        "name": "Kemmerer, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-kemmerer-30-x-60-quadrangle-lincoln-uinta-and-sweetwater-counties-wyoming-wsgs-2004/",
        "ref_title": "Geologic Map Of The Kemmerer 30' X 60' Quadrangle, Lincoln, Uinta, And Sweetwater Counties, Wyoming",
        "authors": "M'Gonigle, J.W. and J.H. Dover",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Open Fille Report 04-7",
        "isbn_doi": "",
        "scale": "large",
        "features": 2699,
        "area": 4734
      },
      {
        "source_id": 46,
        "name": "Seep Ridge, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim geologic map of the Seep Ridge 30' x 60' quadrangle, Uintah, Duchesne, and Carbon Counties, Utah, and Garfield and Rio Blanco Counties, Colorado",
        "authors": "Sprinkel, D.A.",
        "ref_year": "2009",
        "ref_source": "Utah Geological Survey Open-File Report 549DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 1653,
        "area": 4758
      },
      {
        "source_id": 290,
        "name": "Beaver Quad, UT",
        "url": "https://doi.org/10.34191/OFR-686dm",
        "ref_title": "Interim geologic map of the southwestern quarter of the Beaver 30' x 60' quadrangle, Beaver, Iron, and Garfield Counties, Utah",
        "authors": "Rowley, P.D., R.F. Biek, D.B. Hacker, G.S. Vice, R.E. McDonald, D.J. Maxwell, Z.D. Smith, C.G. Cunningham, T.A. Steven, J.J. Anderson, E.B. Ekren, M.N. Machette, and B.R. Wardlaw ",
        "ref_year": "2019",
        "ref_source": "Open-File Report 686DM Utah Geological Survey",
        "isbn_doi": "doi: 10.34191/OFR-686dm",
        "scale": "large",
        "features": 1160,
        "area": 1217
      },
      {
        "source_id": 168,
        "name": "Vermejo Peak, NM",
        "url": "https://pubs.usgs.gov/of/2009/1189/",
        "ref_title": "Preliminary Geologic Map of the Vermejo Peak area, Colfax and Taos Counties, New Mexico and Las Animas and Costilla Counties, Colorado",
        "authors": "Fridrich, C.J., R.R. Shroba, C.L. Pillmore, A.M. Hudson",
        "ref_year": "2009",
        "ref_source": "U.S. Geological Survey Open-File Report 2009-1189",
        "isbn_doi": "",
        "scale": "large",
        "features": 897,
        "area": 618
      },
      {
        "source_id": 268,
        "name": "Coolabah, New South Wales",
        "url": "https://search.geoscience.nsw.gov.au/product/9230",
        "ref_title": "Coolabah 1:100 000 Geological Sheet 8235",
        "authors": "Gilmore P.J., S.J. Trigg, L.M. Campbell, R.A. Hegarty, and C.D. Quinn",
        "ref_year": "2018",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 951,
        "area": 2640
      },
      {
        "source_id": 270,
        "name": "Goulburn, New South Wales",
        "url": "https://search.geoscience.nsw.gov.au/product/172",
        "ref_title": "Goulburn 1:250 000 Geological Sheet SI/55-12, 2nd edition",
        "authors": "O.D. Thomas, D.J. Pogson, A.J. Johnston, M.M. Scott, A.Y.E. Warren, L. Sherwin, G.P. Colquhoun, J.J. Watkins, R.G. Cameron, G.P. MacRae, R.A. Glen & J.J. Vassallo",
        "ref_year": "2013",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 5133,
        "area": 15282
      },
      {
        "source_id": 13,
        "name": "New Zealand Qmap",
        "url": "http://www.gns.cri.nz/Home/Products/Maps/Geological-Maps#gnsgm",
        "ref_title": "Geology Map of New Zealand 1:250 000",
        "authors": "Heron, D.W. ",
        "ref_year": "2014",
        "ref_source": "GNS Science Geological Map 1",
        "isbn_doi": "",
        "scale": "large",
        "features": 55595,
        "area": 267148
      },
      {
        "source_id": 103,
        "name": "New River Gorge",
        "url": "https://irma.nps.gov/DataStore/Reference/Profile/2206387",
        "ref_title": "Digital Bedrock Geologic Map of New River Gorge National River and Vicinity, West Virginia",
        "authors": "McColloch, Hunt, McColloch, Peck, Blake, Matchen, Gooding",
        "ref_year": "2013",
        "ref_source": "Adapted by National Patk Service from West Virginia Geological and Economic Survey Open File Map",
        "isbn_doi": "",
        "scale": "large",
        "features": 565,
        "area": 1526
      },
      {
        "source_id": 291,
        "name": "Promontory Mountains, UT",
        "url": "https://ngmdb.usgs.gov/Prodesc/proddesc_17521.htm",
        "ref_title": "Bedrock Geologic Map of the Promontory Mountains, Box Elder County, Utah (GIS Reproduction of USGS OF-88-646 [1988])",
        "authors": "Crittenden, M.D. Jr.",
        "ref_year": "2019",
        "ref_source": "Utah Geological Survey Open-File Report 698DR",
        "isbn_doi": "",
        "scale": "large",
        "features": 668,
        "area": 893
      },
      {
        "source_id": 66,
        "name": "Huntington, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Huntington 30′ x 60′ quadrangle, Carbon, Emery, Grand, and Uintah Counties, Utah",
        "authors": "Witkin, I.J.",
        "ref_year": "2004",
        "ref_source": "Utah Geological Survey Open-File Report 440D",
        "isbn_doi": "",
        "scale": "large",
        "features": 1599,
        "area": 4792
      },
      {
        "source_id": 6,
        "name": "Dane County, WI",
        "url": "https://wgnhs.uwex.edu/pubs/wofr201301di/",
        "ref_title": "Preliminary Bedrock Geology of Dane County, Wisconsin",
        "authors": "Brown, B.A., Peters, R.M., Massie-Ferch, K.",
        "ref_year": "2013",
        "ref_source": "Open-File Report ",
        "isbn_doi": "",
        "scale": "large",
        "features": 700,
        "area": 3207
      },
      {
        "source_id": 59,
        "name": "Richfield, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Richfield 30′ x 60′ quadrangle, southeast Millard County and parts of Beaver, Piute, and Sevier Counties, Utah",
        "authors": "Hintze, L.F, F.D. Davis, P.D. Rowley, C.G. Cunningham, T.A. Steven, G.C. Willis",
        "ref_year": "2003",
        "ref_source": "Utah Geological Survey Map 195",
        "isbn_doi": "",
        "scale": "large",
        "features": 5259,
        "area": 4825
      },
      {
        "source_id": 253,
        "name": "Tebesjuak Lake, NU",
        "url": "https://doi.org/10.4095/293892",
        "ref_title": "Geology, Tebesjuak Lake, Nunavut (preliminary), scale 1:250 000",
        "authors": "Peterson, T.D., Scott, J.M.J., LeCheminant, A.N., Chorlton, L.B., D’Aoust, B.M.A.",
        "ref_year": "2014",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 158",
        "isbn_doi": "doi: 10.4095/293892",
        "scale": "large",
        "features": 126,
        "area": 11104
      },
      {
        "source_id": 176,
        "name": "Baggs Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-baggs-30-x-60-quadrangle-carbon-and-sweetwater-counties-wyoming-and-moffat-and-routt-counties-colorado-2011/",
        "ref_title": "Geologic Map Of The Baggs 30' X 60' Quadrangle, Carbon And Sweetwater Counties, Wyoming, And Moffat And Routt Counties, Colorado",
        "authors": "Scott, J.E., W.M. Sutherland, J. Johnson,  J.F. McLaughlin,",
        "ref_year": "2011",
        "ref_source": "Wyoming State Geological Survey Map Series 95",
        "isbn_doi": "",
        "scale": "large",
        "features": 1751,
        "area": 4655
      },
      {
        "source_id": 184,
        "name": "Middletown Quad, VA",
        "url": "https://pubs.usgs.gov/gq/gq-1803/",
        "ref_title": "Geologic Map of the Middletown Quadrangle, Frederick, Shenandoah, and Warren Counties, Virginia",
        "authors": "Orndorff, R.C., J.B. Epstein, R.C. McDowell",
        "ref_year": "2007",
        "ref_source": "U.S. Geological Survey Geologic Quadrangle Map 1803",
        "isbn_doi": "",
        "scale": "large",
        "features": 45,
        "area": 150
      },
      {
        "source_id": 101,
        "name": "Ularosa Mountains, NM",
        "url": "https://pubs.usgs.gov/imap/i-2619/",
        "ref_title": "Geologic Map of the Tularosa Mountains 30' x 60' Quadrangle, Catron County, New Mexico",
        "authors": "Ratte, J.C.",
        "ref_year": "2001",
        "ref_source": "U.S. Geological Survey Geologic Investigations Series I-2619",
        "isbn_doi": "",
        "scale": "large",
        "features": 4020,
        "area": 5139
      },
      {
        "source_id": 284,
        "name": "Bogan Gate, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/47",
        "ref_title": "Bogan Gate 1:100 000 Geological Sheet 8431, 1st edition",
        "authors": "Sherwin L., Raymond O.L. and Wallace D.A.",
        "ref_year": "2000",
        "ref_source": "Geological Survey of New South Wales, Sydney & Geoscience Australia, Canberra",
        "isbn_doi": "",
        "scale": "large",
        "features": 763,
        "area": 2584
      },
      {
        "source_id": 183,
        "name": "Kinney Rim Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-kinney-rim-30-x-60-quadrangle-sweetwater-county-wyoming-and-moffat-county-colorado-2004/",
        "ref_title": "Geologic map of the Kinney Rim 30' x 60' Quadrangle, Sweetwater County, Wyoming and Moffat County",
        "authors": "Roehler, H.W.",
        "ref_year": "2004",
        "ref_source": "Wyoming State Geological Survey Open File Report 04-5",
        "isbn_doi": "",
        "scale": "large",
        "features": 140,
        "area": 4654
      },
      {
        "source_id": 44,
        "name": "Delta, UT",
        "url": "http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Geologic map of the Delta 30′ x 60′ quadrangle and part of the Lynndyl 30′ x 60′ quadrangle, northeast Millard County and parts of Juab, Sanpete, and Sevier Counties, Utah",
        "authors": "Hintze, L.F., F.D. Davis",
        "ref_year": "2002",
        "ref_source": "Map 184 Utah Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 3329,
        "area": 5193
      },
      {
        "source_id": 186,
        "name": "Arkansas River valley, CO",
        "url": "https://pubs.er.usgs.gov/publication/sim3382",
        "ref_title": "\nGeologic map of the upper Arkansas River valley region, north-central Colorado",
        "authors": "Kellogg, K.S., R.R. Shroba, C.A. Ruleman, R.G. Bohannon, W.C. McIntosh, W.R. Premo, M.A. Cosca, R.J. Moscati, T.R. Brandt",
        "ref_year": "2017",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3382",
        "isbn_doi": "doi: 10.3133/sim3382",
        "scale": "large",
        "features": 8736,
        "area": 3017
      },
      {
        "source_id": 203,
        "name": "Bairoil Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-bairoil-30-x-60-quadrangle-carbon-sweetwater-fremont-and-natrona-counties-wyoming-2011/",
        "ref_title": "Geologic Map Of The Bairoil 30' X 60' Quadrangle, Carbon, Sweetwater, Fremont, And Natrona Counties, Wyoming",
        "authors": "Jones, N.R., R.W. Gregory and J.F. McLaughlin",
        "ref_year": "2011",
        "ref_source": "Wyoming State Geological Survey Map Series 86",
        "isbn_doi": "",
        "scale": "large",
        "features": 1790,
        "area": 4584
      },
      {
        "source_id": 128,
        "name": "Southwestern Colorado",
        "url": "https://pubs.usgs.gov/of/1999/ofr-99-0427/",
        "ref_title": "Spatial Geologic Data Model for the Gunnison, Grand Mesa, Uncompahgre National Forests Mineral Resource Assessment Area, Southwestern Colorado and Digital Data for the Leadville, Montrose, Durango, and the Colorado Parts of the Grand Junction, Moab, and Cortez 1° x 2° Geologic Maps",
        "authors": "Day, W.C., G.N. Green, D.H. Knepper, R.C. Phillips",
        "ref_year": "1999",
        "ref_source": "U.S. Geological Survey Open-File Report 99-0427",
        "isbn_doi": "",
        "scale": "large",
        "features": 759,
        "area": 10150
      },
      {
        "source_id": 265,
        "name": "Calder River, NWT",
        "url": "https://doi.org/10.4095/292861",
        "ref_title": "Geology, Calder River,\nNorthwest Territories, NTS 86-F (preliminary), scale 1:125,000",
        "authors": "Hildebrand, R.S., Bowring, S.A., and Pelletier, K.S.",
        "ref_year": "2014",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 154",
        "isbn_doi": "doi: 10.4095/292861",
        "scale": "large",
        "features": 1104,
        "area": 10323
      },
      {
        "source_id": 269,
        "name": "Grinnell Glacier, NU",
        "url": "https://doi.org/10.4095/296111",
        "ref_title": "Geology, Grinnell Glacier, Baffin Island, Nunavut (preliminary)",
        "authors": "St-Onge, M.R, N.M. Rayner, H.M. Steenkamp, C. Gilbert",
        "ref_year": "2015",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 217E",
        "isbn_doi": "",
        "scale": "large",
        "features": 543,
        "area": 5783
      },
      {
        "source_id": 261,
        "name": "Terra Nivea, Baffin Island",
        "url": "https://doi.org/10.4095/296104",
        "ref_title": "Geology, Terra Nivea, Baffin Island, Nunavut (preliminary), scale 1:100 000",
        "authors": "St-Onge, M.R., Rayner, N.M., Steenkamp, H.M., and Gilbert, C.",
        "ref_year": "2015",
        "ref_source": "Geological Survey of Canada, Canadian Geoscience Map 215E",
        "isbn_doi": "doi: 10.4095/296104",
        "scale": "large",
        "features": 104,
        "area": 3402
      },
      {
        "source_id": 263,
        "name": "Tooele Quad, UT",
        "url": " http://geology.utah.gov/map-pub/maps/gis/#tab-id-1",
        "ref_title": "Interim Geologic Map of the Tooele 30' x 60' Quadrangle, Tooele, Salt Lake, and Davis Counties, Utah",
        "authors": "Clark, D.L., C.G. Oviatt, D.A. Dinter",
        "ref_year": "2017",
        "ref_source": "Utah Geological Survey Open-File Report 669DM",
        "isbn_doi": "",
        "scale": "large",
        "features": 7098,
        "area": 4689
      },
      {
        "source_id": 216,
        "name": "Red Fern Lake, BC",
        "url": "https://doi.org/10.4095/215465",
        "ref_title": "A GIS dataset of geological features for the Redfern Lake map area (94G/5), British Columbia",
        "authors": "Lane, L.S.",
        "ref_year": "2004",
        "ref_source": "Geological Survey of Canada Open File 4603",
        "isbn_doi": "doi: 10.4095/215465",
        "scale": "large",
        "features": 193,
        "area": 837
      },
      {
        "source_id": 129,
        "name": "Sheridan, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-sheridan-30-x-60-quadrangle-sheridan-johnson-and-campbell-counties-wyoming-and-southeastern-montana/",
        "ref_title": "Geologic Map Of The Sheridan 30' X 60' Quadrangle, Sheridan, Johnson, And Campbell Counties, Wyoming, And Southeastern Montana",
        "authors": "Ver Ploeg, A.J., and C.S. Boyd",
        "ref_year": "2005",
        "ref_source": "Wyoming State Geological Survey Map Series 64, scale 1:100,000",
        "isbn_doi": "",
        "scale": "large",
        "features": 2493,
        "area": 4402
      },
      {
        "source_id": 233,
        "name": "Mount Prudence, BC",
        "url": "https://doi.org/10.4095/293093",
        "ref_title": "Geology, Mount Prudence, British Columbia (preliminary), scale 1:50,000",
        "authors": "McMechan, M.E.",
        "ref_year": "2013",
        "ref_source": "Geological Survey\nof Canada, Canadian Geoscience Map 169",
        "isbn_doi": "doi: 10.4095/293093",
        "scale": "large",
        "features": 69,
        "area": 792
      },
      {
        "source_id": 241,
        "name": "Fond du Lac Co., WI",
        "url": "https://wgnhs.wisc.edu/pubs/m505di/",
        "ref_title": "Data accompanying M505: Bedrock Geology of Fond du Lac County, Wisconsin",
        "authors": "Batten, W.G.",
        "ref_year": "2018",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 23,
        "area": 1983
      },
      {
        "source_id": 142,
        "name": "Santa Barabara, CA",
        "url": "http://www.conservation.ca.gov/cgs/rghm/rgm/Pages/preliminary_geologic_maps.aspx",
        "ref_title": "Geologic Map of the East Half Santa Barbara 30’ x 60’ Quadrangle, California ",
        "authors": "Gutierrez, C.I., S.S. Tan, K.B. Clahan (compilers); C.I. Guitierrez, K.Toman-Sager (digital prep) ",
        "ref_year": "2008",
        "ref_source": "California Department of Conservation California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 8098,
        "area": 2554
      },
      {
        "source_id": 134,
        "name": "Wood County, WI",
        "url": "http://wgnhs.uwex.edu/pubs/000304/",
        "ref_title": "Bedrock Geology of Wood County, Wisconsin",
        "authors": "Brown, B.A., J.K. Greenberg",
        "ref_year": "1986",
        "ref_source": "Wisconsin Geological and Natural History Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 222,
        "area": 2096
      },
      {
        "source_id": 181,
        "name": "Gillette Quad, WY",
        "url": "http://sales.wsgs.wyo.gov/geologic-map-of-the-gillette-30-x-60-quadrangle-campbell-crook-and-weston-counties-wyoming-1998/",
        "ref_title": "Geologic Map Of The Gillette 30' X 60' Quadrangle, Campbell, Crook, And Weston Counties, Wyoming",
        "authors": "Boyd, C.S., and A.J. Ver Ploeg",
        "ref_year": "1998",
        "ref_source": "Wyoming State Geological Survey Map Series 49",
        "isbn_doi": "",
        "scale": "large",
        "features": 1704,
        "area": 4438
      },
      {
        "source_id": 51,
        "name": "Rocky Mountain National Park",
        "url": "https://catalog.data.gov/dataset/digital-geologic-map-of-rocky-mountain-national-park-and-vicinity-colorado-nps-grd-gre-romo",
        "ref_title": "Digital Geologic Map of Rocky Mountain National Park and Vicinity, Colorado",
        "authors": "National Park Service Geologic Resources Evaluation program",
        "ref_year": "2006",
        "ref_source": "National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 3131,
        "area": 2083
      },
      {
        "source_id": 179,
        "name": "Guadalupe Mountains National Park",
        "url": "https://data.doi.gov/dataset/digital-geologic-map-of-guadalupe-mountains-national-park-and-vicinity-texas-nps-grd-gre-g",
        "ref_title": "Digital Geologic Map of Guadalupe Mountains National Park and Vicinity, Texas",
        "authors": "King, P.B. (digitized) ",
        "ref_year": "2007",
        "ref_source": "U.S. National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 1941,
        "area": 1123
      },
      {
        "source_id": 169,
        "name": "Española Basin, NM",
        "url": "http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=531",
        "ref_title": "Geologic map of the southern Española Basin",
        "authors": "Koning, D.J. and A.S. Read",
        "ref_year": "2010",
        "ref_source": "New Mexico Bureau of Geology and Mineral Resources Open-file Report - 531",
        "isbn_doi": "",
        "scale": "large",
        "features": 5562,
        "area": 1918
      },
      {
        "source_id": 71,
        "name": "Southernmost Texas and Mexico",
        "url": "http://pubs.usgs.gov/of/2005/1409/",
        "ref_title": "Preliminary Geologic Map of Southernmost Texas, United States, and parts of Tamaulipas and Nuevo Leon, Mexico: Environmental Health Investigations in the United States-Mexico border region",
        "authors": "Page, W.R., D.P. VanSistine, K.J. Turner",
        "ref_year": "2005",
        "ref_source": "U.S. Geological Survey Open-File Report 2005–1409",
        "isbn_doi": "",
        "scale": "large",
        "features": 4679,
        "area": 63964
      },
      {
        "source_id": 292,
        "name": "Sandpoint Quad, ID",
        "url": "https://www.idahogeology.org/product/dwm-189",
        "ref_title": "Geologic Map of the Sandpoint 30x60 Minute Quadrangle, Idaho and Montana, and the Idaho Part of the Chewelah 30 x 60 Minute Quadrangle",
        "authors": "Lewis, R.S. et al.",
        "ref_year": "2019",
        "ref_source": "Idaho Geological Survey Publicaiton DWM-189",
        "isbn_doi": "",
        "scale": "large",
        "features": 4066,
        "area": 4282
      },
      {
        "source_id": 54,
        "name": "Great Basin National Park",
        "url": "http://catalog.data.gov/dataset/digital-geologic-map-of-great-basin-national-park-and-vicinity-nevada-nps-grd-gre-grba",
        "ref_title": "Digital Geologic Map of Great Basin National Park and Vicinity, Nevada",
        "authors": "National Park Service Geologic Resources Evaluation program",
        "ref_year": "2007",
        "ref_source": "National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 890,
        "area": 1098
      },
      {
        "source_id": 52,
        "name": "Congaree National Park",
        "url": "https://catalog.data.gov/dataset/digital-geologic-map-of-congaree-national-park-and-vicinity-south-carolina-nps-grd-gri-cong-con",
        "ref_title": "Digital Geologic Map of Congaree National Park and Vicinity, South Carolina (NPS, GRD, GRI, CONG, CONG digital map)",
        "authors": "National Park Service Geologic Resources Evaluation program",
        "ref_year": "2010",
        "ref_source": "National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 6708,
        "area": 1605
      },
      {
        "source_id": 64,
        "name": "Greater Denver, CO",
        "url": "http://pubs.usgs.gov/imap/i-856-h/",
        "ref_title": "Geologic Map of the Greater Denver Area, Front Range Urban Corridor, Colorado",
        "authors": "Trimble, D.E., M.N. Machette",
        "ref_year": "2003",
        "ref_source": "U.S. Geological Survey Geologic Investigations Series I-856-H",
        "isbn_doi": "",
        "scale": "large",
        "features": 6136,
        "area": 4465
      },
      {
        "source_id": 111,
        "name": "San Juan Island, WA",
        "url": "https://catalog.data.gov/dataset/digital-geologic-map-of-san-juan-island-national-historical-park-and-vicinity-washington-nps-gr",
        "ref_title": "Digital Geologic Map of San Juan Island National Historical Park and vicinity, Washington",
        "authors": "National Park Service",
        "ref_year": "2012",
        "ref_source": "U.S. Department of the Interior Natural Resource Stewardship and Science Directorate Geologic Resources Division",
        "isbn_doi": "",
        "scale": "large",
        "features": 208,
        "area": 303
      },
      {
        "source_id": 53,
        "name": "Bryce Canyon National Park",
        "url": "https://catalog.data.gov/dataset/digital-geologic-map-of-bryce-canyon-national-park-and-vicinity-utah-nps-grd-gri-brca-brca-digi",
        "ref_title": "Digital Geologic Map of Bryce Canyon National Park and Vicinity, Utah",
        "authors": "National Park Service Geologic Resources Evaluation program",
        "ref_year": "2010",
        "ref_source": "National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 409,
        "area": 480
      },
      {
        "source_id": 215,
        "name": "Mount Merrill, Yukon",
        "url": "https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=222767",
        "ref_title": "Geology, Mount Merrill, Yukon Territory-British Columbia",
        "authors": "Fallas, K.M. and C.A. Evenchick",
        "ref_year": "2006",
        "ref_source": "Geological Survey of Canada Map 2091A",
        "isbn_doi": "",
        "scale": "large",
        "features": 54,
        "area": 774
      },
      {
        "source_id": 108,
        "name": "San Salvador Island",
        "url": "http://specialpapers.gsapubs.org/content/300",
        "ref_title": "Stratigraphic and depositional model for the Bahama Islands",
        "authors": "Carew, J.L. and J.E. Mylroie",
        "ref_year": "1999",
        "ref_source": "In Curran, H. A. and White, B., eds., Geological Society of America Special Paper 300, Terrestrial and Shallow Marine Geology of the Bahamas and Bermuda, p. 5-31",
        "isbn_doi": "",
        "scale": "large",
        "features": 143,
        "area": 106
      },
      {
        "source_id": 202,
        "name": "Deadwood River Quad, ID",
        "url": "http://www.idahogeology.org/Products/reverselook.asp?switch=title&value=Geologic_Map_of_the_Deadwood_River_30_x_60_Minute_Quadrangle,_Idaho",
        "ref_title": "Geologic Map of the Deadwood River 30 x 60 Minute Quadrangle, Idaho",
        "authors": "Kiilsgaard, T.H., L.R. Stanford, R.S. Lewis",
        "ref_year": "2006",
        "ref_source": "Idaho Geologic Survey Map 45",
        "isbn_doi": "",
        "scale": "large",
        "features": 3892,
        "area": 4438
      },
      {
        "source_id": 82,
        "name": "Oakland Metro Area, CA",
        "url": "http://pubs.usgs.gov/mf/2000/2342/",
        "ref_title": "Geologic Map and Map Database of the Oakland Metropolitan Area, Alameda, Contra Costa, and San Francisco Counties, California",
        "authors": "Graymer, R.W.",
        "ref_year": "2000",
        "ref_source": "U.S. Geological Survey Miscellaneous Field Studies MF–2342",
        "isbn_doi": "",
        "scale": "large",
        "features": 2982,
        "area": 1069
      },
      {
        "source_id": 163,
        "name": "Anhalt, Fischer, and Spring Branch Quads, TX",
        "url": "https://pubs.usgs.gov/sim/3333/",
        "ref_title": "Geologic and Hydrostratigraphic Map of the Anhalt, Fischer, and Spring Branch 7.5-Minute Quadrangles, Blanco, Comal, and Kendall Counties, Texas",
        "authors": "Clark, A.K., and R.R. Morris",
        "ref_year": "2015",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3333",
        "isbn_doi": "doi: 10.3133/sim3333",
        "scale": "large",
        "features": 841,
        "area": 502
      },
      {
        "source_id": 38,
        "name": "North Bay Area",
        "url": "https://pubs.usgs.gov/mf/2000/2337/",
        "ref_title": "Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma Counties, California",
        "authors": "Blake, M.C. Jr., R.W. Graymer, and D.L. Jones",
        "ref_year": "2000",
        "ref_source": "U.S. Geological Survey Miscellaneous Field Studies MF 2337",
        "isbn_doi": "",
        "scale": "large",
        "features": 3095,
        "area": 1828
      },
      {
        "source_id": 166,
        "name": "Chisos Mountains, TX",
        "url": "https://pubs.usgs.gov/sim/3140/",
        "ref_title": "Geologic Map of the Chisos Mountains, Big Bend National Park, Texas",
        "authors": "Bohannon, R.G.",
        "ref_year": "2011",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3140",
        "isbn_doi": "",
        "scale": "large",
        "features": 3081,
        "area": 493
      },
      {
        "source_id": 272,
        "name": "Boorowa, NSW",
        "url": "https://search.geoscience.nsw.gov.au/product/49",
        "ref_title": "Boorowa 1:100 000 Geological Sheet 8629, 1st edition",
        "authors": "Johnston A.J., Pogson D.J., Thomas O.D., Watkins J.J. and Glen R.A.",
        "ref_year": "2013",
        "ref_source": "Geological Survey of New South Wales, Maitland",
        "isbn_doi": "",
        "scale": "large",
        "features": 3240,
        "area": 2554
      },
      {
        "source_id": 50,
        "name": "Glacier National Park",
        "url": "https://catalog.data.gov/dataset/digital-geologic-map-of-glacier-national-park-montana-nps-grd-gre-glac",
        "ref_title": "Digital Geologic Map of Glacier National Park, Montana ",
        "authors": "National Park Service Geologic Resources Evaluation program",
        "ref_year": "2006",
        "ref_source": "National Park Service",
        "isbn_doi": "",
        "scale": "large",
        "features": 1569,
        "area": 4074
      },
      {
        "source_id": 211,
        "name": "Mount Martin, Yukon-Northwest Territories",
        "url": "http://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=222639",
        "ref_title": "Geology, Mount Martin, Yukon Territory-Northwest Territories-British Columbia",
        "authors": "Fallas, K.M.",
        "ref_year": "2006",
        "ref_source": "Geological Survey of Canada, Map 2087A",
        "isbn_doi": "",
        "scale": "large",
        "features": 37,
        "area": 774
      },
      {
        "source_id": 214,
        "name": "Lac Maunoir, Northwest Territories",
        "url": "https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=306205",
        "ref_title": "Surficial geology, Lac Maunoir, Northwest Territories",
        "authors": "Fallas, K.M.",
        "ref_year": "2018",
        "ref_source": "Canadian Geoscience Map 311",
        "isbn_doi": "",
        "scale": "large",
        "features": 3,
        "area": 7797
      },
      {
        "source_id": 120,
        "name": "Buffalo National River, AR",
        "url": "https://pubs.usgs.gov/sim/3314/",
        "ref_title": "Geologic map of the west-central Buffalo National River region, northern Arkansas",
        "authors": "Hudson, M.R. and K.J. Turner",
        "ref_year": "2014",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3314",
        "isbn_doi": "doi: 10.3133/sim3314",
        "scale": "large",
        "features": 1643,
        "area": 1127
      },
      {
        "source_id": 121,
        "name": "Washington County, MN",
        "url": "http://conservancy.umn.edu/handle/11299/178852",
        "ref_title": "Geologic Atlas of Washington County, Minnesota",
        "authors": "Bauer, E.J.",
        "ref_year": "2016",
        "ref_source": "Minnesota Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 669,
        "area": 1097
      },
      {
        "source_id": 73,
        "name": "Black Hills, ND",
        "url": "http://pubs.usgs.gov/sim/2777/",
        "ref_title": "Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota",
        "authors": "Redden, J.A., E. DeWitt",
        "ref_year": "2008",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 2777",
        "isbn_doi": "",
        "scale": "large",
        "features": 6164,
        "area": 8912
      },
      {
        "source_id": 165,
        "name": "Driftwood and Wimberley Quads, Hays and Comal Counties, TX",
        "url": "https://pubs.er.usgs.gov/publication/sim3386",
        "ref_title": "Bedrock geology and hydrostratigraphy of the Edwards and Trinity aquifers within the Driftwood and Wimberley 7.5-minute quadrangles, Hays and Comal Counties, Texas",
        "authors": "Clark, A.K., and R.R. Morris",
        "ref_year": "2017",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3386",
        "isbn_doi": "doi: 10.3133/sim3386",
        "scale": "large",
        "features": 441,
        "area": 334
      },
      {
        "source_id": 88,
        "name": "South San Franciso ",
        "url": "http://pubs.usgs.gov/of/1998/of98-354/",
        "ref_title": "Preliminary geologic map of the San Francisco South 7.5' quadrangle and part of the Hunters Point 7.5' quadrangle, San Francisco Bay area, California",
        "authors": "Bonilla, M.G.",
        "ref_year": "1998",
        "ref_source": "U.S. Geological Survey Open-File Report 98-354",
        "isbn_doi": "",
        "scale": "large",
        "features": 1441,
        "area": 146
      },
      {
        "source_id": 70,
        "name": "Mid-Atlantic surficial",
        "url": "http://pubs.usgs.gov/of/2001/of01-227/",
        "ref_title": "Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg",
        "authors": "Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler",
        "ref_year": "2001",
        "ref_source": "U.S. Geological Survey Open-File Report 01-227",
        "isbn_doi": "",
        "scale": "large",
        "features": 3534,
        "area": 2268
      },
      {
        "source_id": 139,
        "name": "Monterey, CA",
        "url": "http://www.quake.ca.gov/gmaps/rgm/monterey/monterey.html",
        "ref_title": "Geologic map of the Monterey 30' x 60' quadrangle, California",
        "authors": "Wagner, D.L., H.G. Greene, G.J. Saucedo, C.L. Pridmore",
        "ref_year": "2002",
        "ref_source": "California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 7787,
        "area": 6599
      },
      {
        "source_id": 210,
        "name": "Chinook north, Alberta–BC",
        "url": "https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/downloade.web&search1=R=297168",
        "ref_title": "Geology, Chinook North, Alberta–British Columbia",
        "authors": "McMechan, M.E. and G.S. Stockmal (comp.)",
        "ref_year": "2015",
        "ref_source": "Geological Survey of Canada, Open File 7475",
        "isbn_doi": "doi:10.4095/297168",
        "scale": "large",
        "features": 1737,
        "area": 11931
      },
      {
        "source_id": 280,
        "name": "Murphy Quad, ID",
        "url": "https://www.idahogeology.org/product/dwm-80",
        "ref_title": "Geologic Map of the Murphy 30 x 60 Quadrangle, Ada, Canyon, Elmore, and Owyhee Counties, Idaho",
        "authors": "Bonnichsen, B., and M.M. Godchaux",
        "ref_year": "2006",
        "ref_source": "Idaho Geological Survey Digital Web Map 80 (DWM-80)",
        "isbn_doi": "",
        "scale": "large",
        "features": 1212,
        "area": 4511
      },
      {
        "source_id": 279,
        "name": "Fairfield Quad, ID",
        "url": "https://www.idahogeology.org/product/dwm-171",
        "ref_title": "Geologic Map of the Fairfield 30 x 60 Minute Quadrangle, Idaho",
        "authors": "Garwood, D.L., J.D. Kauffman, K.L. Orthberg, R.S. Lewis",
        "ref_year": "2014",
        "ref_source": "Idaho Geological Survey Digital Web Map 171 (DWM-171)",
        "isbn_doi": "",
        "scale": "large",
        "features": 3551,
        "area": 4511
      },
      {
        "source_id": 282,
        "name": "East Bonners Ferry Quad, ID, MT",
        "url": "https://www.idahogeology.org/product/dwm-173",
        "ref_title": "Geologic Map of the East Half of the Bonners Ferry 30 x 60 Minute Quadrangle, Idaho and Montana",
        "authors": "Breckenridge, R.M., R.F. Burmester, R.S. Lewis, M.D. McFaddan",
        "ref_year": "2014",
        "ref_source": "Idaho Geological Survey Digital Web Map 173 (DWM-173)",
        "isbn_doi": "",
        "scale": "large",
        "features": 2383,
        "area": 2047
      },
      {
        "source_id": 208,
        "name": "Fort Collins Quad",
        "url": "https://pubs.er.usgs.gov/publication/sim3399",
        "ref_title": "Geologic Map of the Fort Collins 30'×60' quadrangle, Larimer and Jackson Counties, Colorado, and Albany and Laramie Counties, Wyoming",
        "authors": "Workman, J.B., J.C. Cole, R.R. Shroba, K.S. Kellogg, W.R. Premo",
        "ref_year": "2018",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3399",
        "isbn_doi": "doi:10.3133/sim3399",
        "scale": "large",
        "features": 7557,
        "area": 4689
      },
      {
        "source_id": 164,
        "name": "Northern Bexar and Comal Counties, TX",
        "url": "https://pubs.er.usgs.gov/publication/sim3366",
        "ref_title": "Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within northern Bexar and Comal Counties, Texas",
        "authors": "Clark, A.K., J.A. Golab, and R.R. Morris",
        "ref_year": "2016",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3336",
        "isbn_doi": "doi: 10.3133/sim3366",
        "scale": "large",
        "features": 5038,
        "area": 2244
      },
      {
        "source_id": 277,
        "name": "Arco Quad, ID",
        "url": "https://www.idahogeology.org/product/gm-47",
        "ref_title": "Geologic Map of the Arco 30 x 60 Minute Quadrangle, South-Central Idaho",
        "authors": "Skipp, B., L.G. Snider, S.U. Janecke, M.A. Kuntz",
        "ref_year": "2009",
        "ref_source": "Idaho Geological Survey Geologic Map 47 (GM-47)",
        "isbn_doi": "",
        "scale": "large",
        "features": 3718,
        "area": 4475
      },
      {
        "source_id": 278,
        "name": "Idaho City Quad, ID",
        "url": "https://www.idahogeology.org/product/gm-29",
        "ref_title": "Geologic Map of the Idaho City 30 x 60 Minute Quadrangle, Idaho",
        "authors": "Kiilsgaard, T.H., L.R. Stanford, R.S. Lewis",
        "ref_year": "2001",
        "ref_source": "Idaho Geological Survey Geologic Map 29 (GM-29)",
        "isbn_doi": "",
        "scale": "large",
        "features": 4008,
        "area": 4475
      },
      {
        "source_id": 276,
        "name": "Grangeville Quad, ID",
        "url": "https://www.idahogeology.org/product/gm-50",
        "ref_title": "Geologic Map of the Idaho Part of the Grangeville 30 x 60 Minute Quadrangle, and Adjoining Areas of Washington and Oregon",
        "authors": "Kauffman, J.D., K.L. Schmidt, R.S. Lewis, D.E. Stewart, K.L. Othberg, D.L. Garwood",
        "ref_year": "2014",
        "ref_source": "Idaho Geological Survey Geologic Map 50 (GM-50)",
        "isbn_doi": "",
        "scale": "large",
        "features": 2316,
        "area": 3046
      },
      {
        "source_id": 275,
        "name": "Western Salmon Quad, ID-MT",
        "url": "https://www.idahogeology.org/product/gm-52",
        "ref_title": "Geologic Map of the Western Part of the Salmon 30 X 60 Minute Quadrangle, Idaho and Montana",
        "authors": "Burmester, R.F., R.S. Lewis, K.L. Othberg, L.R. Stanford, J.D. Lonn, M.D. McFaddan",
        "ref_year": "2016",
        "ref_source": "Idaho Geological Survey Geologic Map 52 (GM-52)",
        "isbn_doi": "",
        "scale": "large",
        "features": 2755,
        "area": 2046
      },
      {
        "source_id": 259,
        "name": "Funeral Mountains, Ca",
        "url": "https://pubs.usgs.gov/sim/3151/",
        "ref_title": "Geologic map of the southern Funeral Mountains including nearby groundwater discharge sites in Death Valley National Park, California and Nevada",
        "authors": "Fridrich, C.J., Thompson, R.A., Slate, J.L., Berry, M.E., and Machette, M.N.",
        "ref_year": "2012",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3151",
        "isbn_doi": "",
        "scale": "large",
        "features": 4124,
        "area": 1156
      },
      {
        "source_id": 96,
        "name": "Alameda County, CA",
        "url": "https://pubs.usgs.gov/of/1996/of96-252/",
        "ref_title": "Preliminary Geologic Map Emphasizing Bedrock Formations in Alameda County, California",
        "authors": "Graymer, R.W., D.L. Jones, E.E. Brabb",
        "ref_year": "1996",
        "ref_source": "U.S. Geological Survey Open-File Report 96–252",
        "isbn_doi": "",
        "scale": "large",
        "features": 2024,
        "area": 2126
      },
      {
        "source_id": 221,
        "name": "Clear Spring and Hedgesville, MD",
        "url": "http://www.mgs.md.gov/publications/data_pages/quadrangle_geo.html",
        "ref_title": "Geologic and Karst Features Map of the Maryland Portions of the Clear Spring and Hedgesville Quadrangles, Washington Co., Maryland",
        "authors": "Brezinski, D.K., and J.D. Glaser",
        "ref_year": "2014",
        "ref_source": "Maryland Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 160,
        "area": 143
      },
      {
        "source_id": 281,
        "name": "Twinfalls Quad, ID",
        "url": "https://www.idahogeology.org/product/gm-49",
        "ref_title": "Geologic Map of the Twin Falls 30 x 60 Minute Quadrangle, Idaho",
        "authors": "Othberg, K.L., J.D. Kauffman, V.S. Gillerman, D.L. Garwood",
        "ref_year": "2012",
        "ref_source": "Idaho Geological Survey Digital Web Map 49 (DWM-49)",
        "isbn_doi": "",
        "scale": "large",
        "features": 1578,
        "area": 4548
      },
      {
        "source_id": 222,
        "name": "Keedysville, MD",
        "url": "http://www.mgs.md.gov/publications/data_pages/quadrangle_geo.html",
        "ref_title": "Geologic Map of Keedysville and parts of Shepherdstown, Harpers Ferry and Charles Town Quadrangles, Washington and Frederick Counties, Maryland",
        "authors": "Brezinski, D.K.",
        "ref_year": "2009",
        "ref_source": "Maryland Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 339,
        "area": 242
      },
      {
        "source_id": 294,
        "name": "Homestake Reservoir Quad, CO",
        "url": "https://pubs.er.usgs.gov/publication/sim3451",
        "ref_title": "Geologic map of the Homestake Reservoir 7.5′ quadrangle, Lake, Pitkin, and Eagle Counties, Colorado",
        "authors": "Ruleman, C.A., M.G. Frothingham, T.R. Brandt, C.A. Shaw, M.W. Caffee, B.M. Goehring, K.A. Brugger",
        "ref_year": "2020",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3451",
        "isbn_doi": "doi: 10.3133/sim3451",
        "scale": "large",
        "features": 3035,
        "area": 150
      },
      {
        "source_id": 293,
        "name": "Petroglyph National Monument",
        "url": "https://pubs.er.usgs.gov/publication/sim3447",
        "ref_title": "Geologic Map of Petroglyph National Monument and Vicinity, Bernalillo County, New Mexico",
        "authors": "Thompson, R.A., C.F. Chan, A.K. Gilmer, R.R. Shroba",
        "ref_year": "2020",
        "ref_source": "U.S. Geological Survey Scientific Investigations Map 3447",
        "isbn_doi": "",
        "scale": "large",
        "features": 408,
        "area": 149
      },
      {
        "source_id": 91,
        "name": "San Jose, CA",
        "url": "https://pubs.usgs.gov/of/1998/of98-795/",
        "ref_title": "Preliminary Geologic Map of the San Jose 30 X 60 Minute Quadrangle, California",
        "authors": "Wentworth, C.M., M.C. Blake Jr., R.J. McLaughlin, R.W. Graymer.",
        "ref_year": "1999",
        "ref_source": "U.S. Geological Survey Open-File Report 98-795",
        "isbn_doi": "",
        "scale": "large",
        "features": 9200,
        "area": 4923
      },
      {
        "source_id": 83,
        "name": "Point Reyes National Seashore",
        "url": "http://pubs.usgs.gov/of/1997/of97-456/",
        "ref_title": "Geology of Point Reyes National Seashore and Vicinity, California: A Digital Database",
        "authors": "J. C. Clark and E. E. Brabb",
        "ref_year": "1997",
        "ref_source": "USGS Open-File Report 97-456",
        "isbn_doi": "",
        "scale": "large",
        "features": 474,
        "area": 337
      },
      {
        "source_id": 92,
        "name": "Northeast San Francisco Bay Region",
        "url": "http://pubs.usgs.gov/mf/2002/2403/",
        "ref_title": "Geologic Map and Map Database of Northeastern San Francisco Bay Region, California",
        "authors": "Graymer, R.W., D.L. Jones, E.E. Brabb",
        "ref_year": "2002",
        "ref_source": "U.S. Geological Survey Miscellaneous Field Studies Map MF-2403",
        "isbn_doi": "",
        "scale": "large",
        "features": 144,
        "area": 4854
      },
      {
        "source_id": 138,
        "name": "Napa, CA",
        "url": "https://ngmdb.usgs.gov/Prodesc/proddesc_94519.htm",
        "ref_title": "Geologic map of the Napa 30' x 60' quadrangle, California",
        "authors": "Wagner, D.L., and C.I. Gutierrez",
        "ref_year": "2010",
        "ref_source": "California Geological Survey",
        "isbn_doi": "",
        "scale": "large",
        "features": 18787,
        "area": 4885
      }
    ]
  }
}