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Author/Creator
- Geological Survey (U.S.)447
- United States. Environmental Protection Agency24
- New York (State). Department of Environmental Conservation20
- Feltis, R. D. (Richard D.), 1930-18
- Mack, Frederick K.16
- Maryland Geological Survey16
- Arkansas Geological Commission12
- Pettijohn, Robert A.12
- California. Division of Mines and Geology11
- Louisiana. Department of Transportation and Development. Water Resources Section11
- Arkansas Soil and Water Conservation Commission10
- Busby, John F.10
- Mississippi. Bureau of Land and Water Resources10
- Mississippi. Office of Land and Water Resources10
- Jenness, Jane E.9
- Lopez, David A.9
- Louisiana. Department of Transportation and Development9
- Miller, Todd S.9
- National Regional Aquifer Systems Analysis Program (U.S.)9
- Chester County Water Resources Authority8