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<br />oocn7 <br /> <br />RECONNAISSANCE INVESTIGATION OF WATER QUALITY, <br />BOTTOM SEDIMENT, AND BIOTA ASSOCIATED WITH <br />IRRIGATION DRAINAGE IN THE GUNNISON AND <br />UNCOMPAHGRE RIVER BASINS AND AT SWEITZER <br />LAKE, WEST-CENTRAL COLORADO, 1988-89 <br /> <br />by David L. Butler, U.S. Geological Survey, <br />RIchard P. Krueger, U.S. Fish and Wildlife Service, <br />Barbara Campbell Osmundson, U.S. Ash and Wildlife Service <br />Andrew L. Thompson, U.S. Fish and Wildlife Service <br />Steven K. McCall, U.S. Bureau of Reclamation <br /> <br />u.s. GEOLOGICAL SURVEY <br /> <br />Water-Resources Investigations Report 914103 <br /> <br />Prepared in cooperation with the <br /> <br />US. ASH AND WlillUFE SERVICE. and the <br />U.S. BUREAU OF REClAMATION <br /> <br />Del1\oer, Coloraoo <br />1991 <br /> <br />