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Agricultural drainage wells : impact on ground water

Ludwig, Ralph D.
Ada, OK : Robert S. Kerr Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, [1990] 1990

Water quality standards for the 21st century proceedings of the third national conference, Las Vegas

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