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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 <br />not consmute endorsement by the U.S. Geological Survey. <br /> <br />For additional information write to: <br /> <br />Copies of this report can be purchased <br />from: <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 />U.S. Geological Survey <br />Information Services <br />Box 25286 <br />Federal Center <br />Denver, CO 80225-0046 <br /> <br />Information regarding research and data-collection programs of the U.S. Geological Survey is available on <br />the Internet via the World Wide Web. You may connect to the home page for the Arizona District Office <br />using the URL http://az.water.usgs.gov. <br />