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<br />U.S. DEPARTMENT OF THE INTERIOR <br />GALE A. NORTON, Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br />Charles G. Groat. Director <br /> <br />f'. . ; <br />k,."',,,... <br />. '.r' <br /> <br />The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute <br />endorsement by the U.S. Geological Survey. <br /> <br />For additional information write to: <br /> <br />District Chief <br />U.S. Geological Survey <br />Water Resources Division <br />520 N. Park Avenue, Suite 221 <br />Tucson, AZ 85719-5035 <br /> <br />Copies of this report can be purchased from: <br /> <br />U.S. Geological Survey <br />Information Services <br />80x 25286 <br />Federal Center <br />Denver, CO 80225-0046 <br /> <br />Illr~nnation about U.s.~loQical Survey programs in Arizona is available online at http://az.water.usgs,gov. <br />. -:>I- <br />'.. ,I <br />