By Dennis A. Wentz, Bernadine A. Bonn, Kurt D. Carpenter, Stephen R. Hinkle, Mary L. Janet, Frank A. Rinella, Mark A. Uhrich, Ian R. Waite, Antonius Laenen, and Kenneth E. Bencala
U.S. GEOLOGICAL SURVEY CIRCULAR 1161
A contribution of the National Water-Quality Assessment (NAWQA) Program
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