By Marian P. Berndt, Hilda H. Hatzell, Christy A. Crandall, Michael Turtora, John R. Pittman, and Edward T. Oaksford
U. S. GEOLOGICAL SURVEY CIRCULAR 1151
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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