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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 />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 />Box 25286 <br />Federal Center <br />Denver, CO 80225-0046 <br /> <br />~!;1() il I <br />lntbrmation about U.S, Geological Survey programs in Arizona is available online at http://az,water.usgs,gov. <br />