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Author/Creator
- Geological Survey (U.S.)245
- New York (State). Department of Environmental Conservation20
- Mack, Frederick K.16
- Maryland Geological Survey16
- Pettijohn, Robert A.12
- Busby, John F.10
- United States. Environmental Protection Agency10
- Arkansas Soil and Water Conservation Commission9
- Mississippi. Office of Land and Water Resources9
- Arkansas Geological Commission8
- Chester County Water Resources Authority8
- Curtin, Stephen E.8
- Reynolds, Richard J.8
- Smoot, Charles W.8
- Arizona. Department of Water Resources7
- Louisiana. Department of Transportation and Development7
- Mississippi. Bureau of Land and Water Resources7
- National Regional Aquifer Systems Analysis Program (U.S.)7
- Andreasen, David C.6
- Bedinger, M. S.6