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WATER - QUALITY ASSESSMENT OF THE SOUTH PLATTE <br />RIVER BASIN, COLORADO, NEBRASKA, AND WYOMING- - <br />ANALYSIS OF AVAILABLE NUTRIENT, SUSPENDED - <br />SEDIMENT, AND PESTICIDE DATA, WATER YEARS 1980 -92 <br />ao <br />oe <br />U.S. GEOLOGICAL SURVEY <br />Water- Resources Investigations Report 94 -4095 <br />NATIONAL WATER - QUALITY ASSESSMENT PROGRAM <br />