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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />CECIL D. ANDRUS, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />H. William Menard, Director <br /> <br />For additional information <br />write to: <br /> <br />For sale by: <br /> <br />District Chief <br />U.S. Geological Survey <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br />Lakewood, CO 80225 <br /> <br />Open-File Services Section <br />Branch of Distribution <br />U.S. Geological Survey, Hail Stop 306 <br />Box 25425, Denver Federal Center <br />Denver, CO 80225 <br />(303) 234-5888 <br />