Geological Survey (U.S.) 2,230
Geological Survey (U.S.), 1,397
National Water-Quality Assessment Program (U.S.) 299
United States. Environmental Protection Agency 113
United States. Bureau of Reclamation 90
United States. Bureau of Land Management 73
United States. National Park Service 71
U.S. Fish and Wildlife Service 47
United States. Army. Corps of Engineers 47
SpringerLink (Online service) 44
United States. Environmental Protection Agency. Office of Water 44
United States. Department of Energy 39
United States. Bureau of Indian Affairs 36
California. State Water Resources Control Board 34
New York (State). Department of Environmental Conservation 28
Geological Survey (U.S.). Water Resources Division 27
New Jersey. Department of Environmental Protection 23
Washington (State). Department of Ecology 23
Wisconsin. Department of Natural Resources 22
Missouri. Division of Environmental Quality 21
Belitz, Kenneth 19
Colorado. Department of Public Health and Environment. Water Quality Control Division 19
Kansas. Department of Health and Environment 19
United States. Environmental Protection Agency, 19
Wells, J. V. B. 19
Florida. Department of Environmental Regulation 18
Ground Water Ambient Monitoring and Assessment Program (Calif.) 17
Illinois. Environmental Protection Agency 17
Pennsylvania. Department of Environmental Protection 17
Southwest Florida Water Management District (Fla.) 16
Andrews, William J., 1962- 15
Colorado Geological Survey 15
Field, Stephen J. 1935- 15
Monroe County (N.Y.). Department of Health 15
Pope, Larry M. 15
Robertson, Dale M. 15
Tanner, Dwight Q. 15
Welch, Alan H. 15
Williams, Rhea P. 15
Butler, David L. 1946- 14
Ohio. Division of Reclamation 14
United States. Forest Service 14
Wichita (Kan.) 14
Louisiana. Department of Transportation and Development 13
Minnesota. Department of Natural Resources 13
New Jersey. Department of Environmental Protection and Energy 13
Rose, William J. 13
South Florida Water Management District (Fla.) 13
Tornes, L. H. 13
California. Department of Water Resources 12
Love, S. K. 1903-1995 12
Minnesota Pollution Control Agency 12
Parliman, D. J. 12
Petersen, James C. 1952- 12
St. Johns River Water Management District (Fla.) 12
Woodside, M. D. 12
Arizona. Department of Water Resources 11
Chesapeake Bay Program (U.S.) 11
Colorado. Oil and Gas Conservation Commission 11
Kimbrough, Robert, 1957- 11
Montana. Department of Natural Resources and Conservation 11
National Water-Quality Assessment Program (U.S.), 11
Peterson, David A. 1955- 11
Sando, Steven Kent, 1956- 11
Wyoming. State Engineer's Office 11
Belitz, Kenneth, 10
Clark, G. M. 1958- 10
Colorado Water Resources Research Institute 10
Hamilton, Pixie A. 10
Oregon. Department of Environmental Quality 10
Sherwood, Donald A. 10
Spahr, Norman E. 10
Wolf, R. J. 10
Young, H. W. 1942- 10
Brabets, Timothy P. 9
Bragg, Heather M. 9
Connecticut. Department of Environmental Protection 9
Ebbert, J. C. 9
Garrett, Ronald G. 9
Hall, Dennis C. 9
Houston (Tex.) 9
Idaho. Department of Water Resources 9
Langland, Michael J. 9
Massachusetts. Department of Environmental Protection. Office of Watershed Management 9
New Hampshire. Water Resources Division 9
New Martinsville (W. Va.) 9
Oblinger, Carolyn J. 9
Rickert, David A., 1940- 9
Speiran, Gary K., 9
United States. Environmental Protection Agency. Office of Research and Development 9
United States. Federal Highway Administration 9
Alpers, Charles N., 1958- 8
Anderson, Chauncey W. 8
Arkansas. Department of Pollution Control and Ecology 8
Bales, Jerad 8
Barker, James L., 1936- 8
Bartholomay, Roy C. 8
Brabets, Timothy P., 8
Clark, Melanie L. 8
Colorado. Water Quality Control Commission 8