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Author/Creator
- United States. Environmental Protection Agency. Office of Water34
- Geological Survey (U.S.)27
- United States22
- United States. Environmental Protection Agency. Region I.16
- Environmental Research Laboratory (Athens, Ga.)15
- United States. Environmental Protection Agency12
- United States. Environmental Protection Agency. Office of Research and Development8
- Municipal Environmental Research Laboratory7
- Barnwell, Thomas O.6
- United States. Environmental Protection Agency. Region VIII6
- Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)5
- Environmental Research Laboratory (Duluth, Minn.)4
- Robert S. Kerr Environmental Research Laboratory4
- Tetra Tech, inc4
- Thurston, Robert V.4
- United States. Bureau of Reclamation4
- United States. Environmental Protection Agency. Office of Water Regulations and Standards4
- Chesapeake Bay Program (U.S.)3
- Engineering and Research Center (U.S.). Applied Sciences Branch3
- National Exposure Research Laboratory (U.S.). Ecosystems Research Division3