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<br />U.S. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br />Thomas J. Casadevall, Acting Director <br /> <br />The use of firm, trade, and brand names in this report is for identification purposes only and does not <br />constitute 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 North Park Avenue, Suite 221 <br />Tucson, AZ 85719-5035 <br /> <br />U.S. Geological Survey <br />I nformation Services <br />Box 25286 <br />Federal Center <br />Denver, CO 80225-0286 <br />