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Author/Creator
- Geological Survey (U.S.)382
- National Water-Quality Assessment Program (U.S.)51
- United States. National Park Service14
- Missouri. Division of Environmental Quality9
- South Dakota Geological Survey9
- United States. Bureau of Land Management8
- Omang, R. J.7
- Plafcan, Maria7
- Shade, Patricia J.7
- Wyoming. State Engineer's Office7
- Arkansas Soil and Water Conservation Commission6
- Andrews, William J., 1962-5
- Arkansas Geological Commission5
- Connecticut. Department of Environmental Protection5
- Lee, K. E. (Kathy E.)5
- New Jersey. Department of Environmental Protection5
- Oblinger, Carolyn J.5
- United States. Bureau of Reclamation5
- Krimmel, Robert M.4
- Kroening, Sharon E.4