Portland, Oregon : U.S. Department of the Interior, U.S. Geological Survey, 1996
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Occurrence of selected trace elements and organic compounds and their relation to land use in the Willamette River basin, Oregon, 1992-94 / by Chauncey W. Anderson, Frank A. Rinella and Stewart A. Rounds ; U.S. Geological Survey ; prepared in cooperation with Oregon Department of Environmental Quality, Willamette River Technical Advisory Steering Committee, and National Water-Quality Assessment Program