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INVENTORY OF BIOLOGICAL INVESTIGATIONS <br />RELATED TO STREAM WATER QUALITY IN THE <br />SOUTH PLATTE RIVER BASIN, COLORADO, <br />NEBRASKA, AND WYOMING, 1891 -1994 <br />by Cathy M. Tate and Jorge R. Ortiz -Zayas <br />U.S. GEOLOGICAL SURVEY <br />Open -File Report 95 -379 <br />Denver, Colorado <br />1995 <br />