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Summary of Biological and Contaminant <br />Investigations Related to Stream Water <br />Quality and Environmental Setting in the <br />Upper Colorado River Basin, 1938--95 <br />By JEFFREY R. DEACON and VERLIN C. STEPHENS <br />U.S. GEOLOGICAL SURVEY <br />Water-Resources Investigations Report 96-4172 <br />Denver, Colorado <br />1996 <br />