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<br />U.S. DEPARTMENT OF THE INTERIOR <br />MANUEL LUJAN, JR., Secretary <br />U.S. GEOLOGICAL SURVEY <br />Dallas L. Peck, Director <br /> <br />District Chief <br />U.S. Geological Survey <br />Box 25046, Mail Stop 415 <br />Federal Center <br />Denver, CO 80225-0046 <br /> <br />Copies of this report can <br />be purchased from: <br /> <br />u.s. Geological Survey <br />Books and Open-File Reports Section <br />Box 25425, Mail Stop 517 <br />Federal Center <br />Denver, CO 80225-0425 <br /> <br />For additional information <br />write to: <br />