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<br />o Interim Results of Quality-Control Sampling <br />~ of Surface Water for the Upper Colorado <br />~. River National Water-Quality Assessment <br />Study Unit, Water Years 1995-96 <br /> <br />By Norman E, Spahr and Robert W. Boulger <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Water-Resources Investigations Report 97-4227 <br /> <br />Denver, Colorado <br />1997 <br />