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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />JAMES G. WATT, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />Doyle G. Frederick, Acting Director <br /> <br />For additional information write to: <br /> <br />Colorado District Chief <br />U . S. Geological Survey, MS II 15 <br />Box 250116, Denver Federal Center <br />Lakewood, CO 80225 <br />