Water-quality assessment of South-Central Texas [electronic resource] : descriptions and comparisons of nutrients, pesticides, and volatile organic compounds at three intensive fixed sites, 1996-98

by Patricia B. Ging.
Austin, Tex. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor], 1999.
Water-resources investigations report ; 99-4155.

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