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Effects of Piping Irrigation Laterals <br />on Selenium and Salt Loads, <br />Montrose Arroyo Basin, <br />Western Colorado <br />By David L. Butler <br />U.S. GEOLOGICAL SURVEY <br />Water-Resources Investigations Report 01-4204 <br />Prepared in cooperation with the <br />BUREAU OF RECLAMATION <br />Denver, Colorado <br />2001