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Iggiv Uea~b~ aid s~~ph~s ~~~~ <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 />ENr oFT <br />U.S. GEOLOGICAL SURVEY Q4pP~M ._._. y~~'Z~ <br />P_ <br />V/ O <br />Water-Resources Investigations Report 96-4172 <br />s <br />4gCH 3 ~~ <br />NATIONAL WATER-QUALITY ASSESSMENT PROGRAM <br />