Geological Survey (U.S.) 590 Geological Survey (U.S.), 485 United States. Environmental Protection Agency 46 United States. Department of Energy 34 United States. Department of Energy. Nevada Operations Office 34 United States. National Park Service 21 United States. Bureau of Reclamation 19 National Regional Aquifer Systems Analysis Program (U.S.) 16 South Florida Water Management District (Fla.) 16 United States. Bureau of Land Management 16 National Water-Quality Assessment Program (U.S.) 15 Nassau County (N.Y.). Department of Public Works 14 Southwest Florida Water Management District (Fla.) 14 New Jersey. Department of Environmental Protection 13 ScienceDirect (Online service) 13 Suffolk County (N.Y.). Department of Health Services 13 United States. Army. Corps of Engineers 13 Dumouchelle, D. H. 12 Washington (State). Department of Ecology 11 Aberdeen Proving Ground (Md.). Environmental Conservation and Restoration Division 10 Minnesota. Department of Natural Resources 10 Oregon. Water Resources Department 10 SpringerLink (Online service) 10 St. Johns River Water Management District (Fla.) 10 Wyoming. State Engineer's Office 10 Masterson, John P. 9 Bauer, H. H. 8 Berger, David L. 1958- 8 Walter, Donald A. 8 Arkansas Soil and Water Conservation Commission 7 California. Department of Water Resources 7 Florida. Department of Environmental Protection 7 Florida. Department of Environmental Regulation 7 Idaho. Department of Water Resources 7 Mull, D. S. 1933- 7 New York (N.Y.). Department of Environmental Protection 7 New York (State). Department of Environmental Conservation 7 Oklahoma Water Resources Board 7 San Antonio Water System (Tex.) 7 Suffolk County Water Authority 7 U.S. Fish and Wildlife Service 7 Alpers, Charles N., 1958- 6 California. State Water Resources Control Board 6 Clarke, J. S. 6 East Bay Municipal Utility District (Calif.) 6 Laczniak, Randell J. 6 Lee, T. M. 6 Lindgren, Richard J. 6 Martin, Peter, 1953- 6 Mississippi. Office of Land and Water Resources 6 New Mexico. State Engineer Office 6 Prudic, David E. 6 Prudic, David E., 6 Reilly, Thomas E. 6 San Bernardino Valley Municipal Water District (Calif.) 6 United States. Department of Energy. Office of Environmental Management 6 United States. National Nuclear Security Administration. Nevada Site Office 6 Wisconsin. Department of Natural Resources 6 Arkansas Geological Commission 5 Arthur, J. Kerry 5 Bartolino, James R., 5 Hansen, Arnold J., 1932- 5 Krohelski, J. T. 5 Massachusetts. Office of Water Resources 5 Sloto, Ronald A. 5 Smith, Barry S. 5 Taylor, R. E. 1934- 5 Tenbus, Frederick J. 5 Tucci, Patrick, 5 United States. Department of the Army 5 Air Force Center for Environmental Excellence (U.S.) 4 Arizona. Department of Water Resources 4 Army Armament Research, Development, and Engineering Center (U.S.) 4 Bair, E. Scott 4 Barlow, Paul M. 4 Bennett, Gordon D. 4 Brookhaven (N.Y.) 4 Chester County Water Resources Authority 4 Chu, Anthony, 4 Delaware River Basin Commission 4 Drinking Water Program (Mass.) 4 Eberts, Sandra M. 4 Franke, O. Lehn 4 Gannett, Marshall W. 4 Georgia. Environmental Protection Division 4 Halford, Keith J. 4 Halford, Keith J., 4 Hanson, Ronald L. 1934- 4 Hunt, R. J. 4 Imes, Jeffrey L. 4 Langer, William H. 4 Lee, Roger W., 4 Mason, James L., 1948- 4 Maurer, Douglas K., 4 McFarland, E. Randolph 4 Memphis (Tenn.). Light, Gas, and Water Division 4 Miller, Todd S. 4 Miller, Todd S., 4 Mills, Patrick C. 4 Minnesota Pollution Control Agency 4