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Author/Creator
- Geological Survey (U.S.)1,531
- National Water-Quality Assessment Program (U.S.)74
- United States. Department of Energy53
- United States. Environmental Protection Agency51
- United States. Bureau of Land Management31
- New York (State). Department of Environmental Conservation25
- Arkansas Soil and Water Conservation Commission23
- Arkansas Geological Commission19
- Washington (State). Department of Ecology19
- Maryland Geological Survey18
- Southwest Florida Water Management District (Fla.)18
- United States. Bureau of Indian Affairs18
- United States. Bureau of Reclamation18
- Minnesota. Department of Natural Resources17
- Mack, Frederick K.16
- United States. National Park Service16
- Nassau County (N.Y.). Department of Public Works15
- New Jersey. Department of Environmental Protection15
- South Florida Water Management District (Fla.)15
- Arizona. Department of Water Resources14