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<br />Nitrogen and Phosphorus Data for <br />Surface Water in the Upper Colorado <br />River Basin, Colorado, 1980-94 <br /> <br />By Kirby H. Wynn and Norman E. Spahr <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Open-File Report 97-233 <br /> <br />Denver, Colorado <br />1997 <br /> <br />