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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />Rogers C. B. Morton, Secretary <br /> <br />GEOLOGICAL SURVEY <br />V. E. McKelvey, Director <br /> <br />FOR ADDITIONAL INFORMATION WRITE TO, <br /> <br />U. S. GEOLOGICAL SURVEY <br />FEDERAL BUILDING <br />300 EAST 8TH STREET <br /> <br />AUSTIN, TEXAS 78701 <br /> <br />IT <br />