By Timothy B. Spruill, Douglas A. Harned, Peter M. Ruhl, Jo Leslie Eimers, Gerard McMahon, Kelly E. Smith, David R. Galeone, and Michael D. Woodside
U.S. GEOLOGICAL SURVEY CIRCULAR 1157
A contribution of the National Water-Quality Assessment (NAWQA) Program
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U.S. Department of the Interior, U.S. Geological Survey
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