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Author/Creator
- Geological Survey (U.S.)59
- Pettijohn, Robert A.11
- Busby, John F.10
- Mack, Frederick K.9
- Maryland Geological Survey9
- National Regional Aquifer Systems Analysis Program (U.S.)8
- Andreasen, David C.5
- Curtin, Stephen E.5
- Beckman, Jeffery D.4
- Maryland Power Plant Research Program4
- New York (State). Department of Environmental Conservation4
- Bugliosi, Edward F.3
- Cervantes, Michael A., 1957-3
- Layman, Thomas B.3
- Wheeler, Judith C.3
- Black Hills Conservancy Sub-District (S.D. and Wyo.)2
- Idaho. Division of Environmental Quality2
- Lumber River Council of Governments2
- Maryland. Energy Administration2
- Maryland. Tidewater Administration2