1. Seasonal and spatial variability of nutrients and pesticides in streams of the Willamette Basin, Oregon, 1993-95 Author/Creator: Rinella, Frank A., author Publication/Creation: Portland, Oregon : U.S. Department. of the Interior, U.S. Geological Survey, 1998 Resource Type: Book Access & Availability: Loading
2. Selected trace-element and organic contaminants in the streambed sediments of the Potomac River basin, August 1992 Author/Creator: Gerhart, James M., author Publication/Creation: Towson, MD : United States Geological Survey, [1995] Resource Type: Book Access & Availability: Loading