MLA

Bonn, Bernadine A, Washington County (Or.). Unified Sewerage Agency, and Geological Survey (U.S.). Selected Elements and Organic Chemicals In Bed Sediment and Fish Tissue of the Tualatin River Basin, Oregon, 1992-96. Tualatin River, Oregon, United States, (Hydrographic): U.S. Dept. of the Interior, U.S. Geological Survey ; Information Services, 1999.