By Kevin F. Dennehy, David W. Litke, Cathy M. Tate, Sharon L. Qi, Peter B. McMahon, Breton W. Bruce, Robert A. Kimbrough, and Janet S. Heiny
U.S. GEOLOGICAL SURVEY CIRCULAR 1167
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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