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Butler, D.L..-Effects of Piping Irrigation Laterals on Selenium and Salt Loads, Montrose Arroyo Basin, Western Colorado USGS/WRIR 01-4204 <br />d <br />a <br />d <br />a <br />a <br />0 <br />e <br />0 <br />as <br />e <br />.` <br />a <br />