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<br />U,S. DEPARTMENT OF THE INTERIOR <br /> <br />CECIL D, ANDRUS, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />H. William Menard, Director <br /> <br />Open-File Report <br /> <br />For additional information write to: <br /> <br />District Chief <br />U.S. Geological Survey <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br />Lakewood, CO 80225 <br />