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Author/Creator
- Geological Survey (U.S.)596
- United States. Environmental Protection Agency29
- Feltis, R. D. (Richard D.), 1930-18
- New York (State). Department of Environmental Conservation16
- Arkansas Soil and Water Conservation Commission15
- Arkansas Geological Commission14
- Miller, Todd S.14
- New Jersey. Department of Environmental Protection14
- Mississippi. Office of Land and Water Resources13
- Mack, Frederick K.12
- Maryland Geological Survey12
- National Regional Aquifer Systems Analysis Program (U.S.)12
- Pettijohn, Robert A.12
- Busby, John F.11
- Alabama. Department of Environmental Management10
- Minnesota. Department of Natural Resources10
- United States. Department of Energy10
- Brahana, J. V.8
- Smoot, Charles W.8
- Brockman, Allen R. (Allen Richard), 1961-7