Author
Geological Survey (U.S.)
2,901
Geological Survey (U.S.),
1,826
National Water-Quality Assessment Program (U.S.)
403
United States. Environmental Protection Agency. Office of Water
336
United States. Environmental Protection Agency
205
United States. Bureau of Reclamation
186
Colorado. Department of Public Health and Environment. Water Quality Control Division
143
United States. Department of the Interior
118
SpringerLink (Online service)
106
United States. National Park Service
88
United States. Bureau of Land Management
87
U.S. Fish and Wildlife Service
82
Source Water Assessment and Protection Program (Colo.)
65
California. State Water Resources Control Board
59
United States. Army. Corps of Engineers
54
Library of Congress. Congressional Research Service,
53
United States. Congress. Senate. Committee on Environment and Public Works,
52
United States. Department of Energy
51
United States. Bureau of Indian Affairs
49
ScienceDirect (Online service)
46
Colorado Water Resources Research Institute
42
United States. Congress. Senate. Committee on Environment and Public Works
39
Belitz, Kenneth
38
United States. Environmental Protection Agency. Office of Research and Development
38
United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Water Resources and Environment
36
Colorado Water Conservation Board
34
United States. Environmental Protection Agency,
34
New Jersey. Department of Environmental Protection
33
Wisconsin. Department of Natural Resources
33
New York (State). Department of Environmental Conservation
31
Geological Survey (U.S.). Water Resources Division
30
Ground Water Ambient Monitoring and Assessment Program (Calif.)
30
United States. Congress. House. Committee on Transportation and Infrastructure
28
United States. Environmental Protection Agency. Health and Ecological Criteria Division
26
Washington (State). Department of Ecology
26
Colorado State University. Cooperative Extension Service
25
Pennsylvania. Department of Environmental Protection
25
Florida. Department of Environmental Regulation
23
United States. Army. Corps of Engineers. Pacific Division
23
United States. Forest Service
23
United States. National Park Service. Natural Resource Stewardship and Science,
23
Colorado. Water Quality Control Commission
22
Belitz, Kenneth,
21
Kansas. Department of Health and Environment
21
Missouri. Division of Environmental Quality
21
National Exposure Research Laboratory (U.S.)
21
United States. Environmental Protection Agency. Office of Wetlands, Oceans, and Watersheds
21
Waskom, R. M.
21
Colorado. Oil and Gas Conservation Commission
20
Illinois. Environmental Protection Agency
20
more ...