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Author/Creator
- Geological Survey (U.S.)3,361
- National Water-Quality Assessment Program (U.S.)168
- California. State Water Resources Control Board99
- United States. Department of Energy89
- United States. Environmental Protection Agency87
- Belitz, Kenneth68
- United States. Bureau of Land Management55
- United States. Bureau of Reclamation51
- Southwest Florida Water Management District (Fla.)49
- Ground Water Ambient Monitoring and Assessment Program (Calif.)44
- New York (State). Department of Environmental Conservation44
- United States. Bureau of Indian Affairs40
- Louisiana. Department of Transportation and Development39
- Library of Congress. Congressional Research Service35
- United States. National Park Service31
- Arizona. Department of Water Resources30
- California. Department of Water Resources30
- South Florida Water Management District (Fla.)29
- Arkansas Soil and Water Conservation Commission28
- Washington (State). Department of Ecology28