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ENVIRONMENTAL SETTING AND IMPLICATIONS ON <br />WATER QUALITY, UPPER COLORADO RIVER BASIN, <br />COLORADO AND UTAH <br />By LORI E. APODACA, NANCY E. DRIVER, VERLIN C. STEPHENS, <br />and NORMAN E. SPAHR <br />U.S. GEOLOGICAL SURVEY <br />Water-Resources Investigations Report 95-4263 <br />Denver, Colorado <br />1996 <br />