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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />ROGERS C. B. MORTON, Secretary <br /> <br />GEOlOGICAL SURVEY <br /> <br />William T. Pecora, Director <br /> <br />UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON, 1973 <br /> <br />For sale by the Superintendent of Documents, U.s. Government Printing Office <br />Washington, D.C. 20402 <br />Stock No. 2401-00315 <br /> <br />. <br /> <br />. <br /> <br />. <br />