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