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Author/Creator
- Geological Survey (U.S.)7
- South Dakota. Department of Environment and Natural Resources5
- Strobel, Michael L.5
- West Dakota Water Development District (S.D.)5
- Maps.com (Firm)4
- United States. Central Intelligence Agency4
- Cannon, William F.1
- Machette, Michael N.1
- Ottke, Doug1
- Personius, Stephen F.1
- Stone, Byron D.1
- U.S. Census Bureau1