National Water Quality Management Conference (1st : 1980 : Atlanta, Ga.)
Washington, D.C. : Water Planning Division, Office of Water Program Operations, U.S. Environmental Protection Agency, 1980.
1980
National Conference on Water Quality Criteria and Standards (3rd : 1992 : Las Vegas, Nev.)
Washington, D.C. : U.S. Environmental Protection Agency, Office of Science and Technology, [1992]
1992