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Author/Creator
- Geological Survey (U.S.)[remove]275
- United States. Bureau of Land Management14
- United States. Environmental Protection Agency14
- Mack, Frederick K.12
- Maryland Geological Survey12
- Busby, John F.10
- National Water-Quality Assessment Program (U.S.)10
- Pettijohn, Robert A.10
- Arkansas Geological Commission9
- Arkansas Soil and Water Conservation Commission9
- Mississippi. Office of Land and Water Resources9
- National Regional Aquifer Systems Analysis Program (U.S.)8
- New York (State). Department of Environmental Conservation7
- Andreasen, David C.6
- Curtin, Stephen E.6
- Goldsmith, Gala D. S.6
- Mississippi. Bureau of Land and Water Resources6
- United States. Department of Energy. Nevada Operations Office6
- Brahana, J. V.5
- Burt, David E., 1960-5