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Author/Creator
- Geological Survey (U.S.)407
- Southwest Florida Water Management District (Fla.)25
- Maryland Geological Survey22
- Mack, Frederick K.21
- New York (State). Department of Environmental Conservation20
- Pettijohn, Robert A.14
- Curtin, Stephen E.13
- South Florida Water Management District (Fla.)12
- United States. Environmental Protection Agency12
- Arkansas Soil and Water Conservation Commission11
- Andreasen, David C.10
- Arizona Water Commission10
- Arkansas Geological Commission10
- Busby, John F.10
- Ortiz, A. G.10
- St. Johns River Water Management District (Fla.)10
- Mississippi. Bureau of Land and Water Resources9
- Mississippi. Office of Land and Water Resources9
- Chester County Water Resources Authority8
- Kinnaman, Sandra L.8