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<br />1 <br /> <br />U- ,.. '-- <br /> <br />~ <br />A <br />~ <br />~ <br /> <br />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 /> <br /> <br />, <br /> <br />~.. "-,- <br /> <br />... <br /> <br />, <br /> <br />~." <br /> <br />\. IJ-..". <br />.,1 .~ <br />r . <br />-'= <br /> <br />. <br /> <br />National Water-Quality <br />Assessment Study Unit <br /> <br />",' <br /> <br />U.S. GEOLOGICAL SURVEY <br />Water-Resources Investigations Report 96-4172 <br /> <br /> <br />NATIONAL WATER-QUALITY ASSESSMENT PROGRAM <br />