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Author/Creator
- Geological Survey (U.S.)72
- Maps.com (Firm)49
- United States. Central Intelligence Agency15
- South Dakota. Department of Environment and Natural Resources10
- West Dakota Water Development District (S.D.)10
- National Atlas & Thematic Mapping Organisation (India)9
- United States. National Oceanic and Atmospheric Administration7
- Valentine, Page C.7
- Baker, Jessica L.6
- Unger, Tanya S.6
- Carter, Janet M.5
- Redden, Jack A. (Jack Allison), 1926-20195
- Strobel, Michael L.5
- United States. Environmental Protection Agency5
- Circum-Pacific Council for Energy and Mineral Resources4
- Circum-Pacific Map Project4
- Gryc, George3
- Harrison, Richard W.3
- Aitken, D. S.2
- Arnold, L. R.2