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<br /> <br />1'.' <br />Q' <br />- <br />~. <br /> <br />, <br />-. <br /> <br /> <br />QUALITY OF WATER <br />COLORADO RIVER BASIN <br /> <br />Progress Report No. 19 <br /> <br />U.S. Department of the Interior <br /> <br />January 1999 <br /> <br /> <br />