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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br />STEWART L. UDALL, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />William 1. Pecora, Director <br /> <br />UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1968 <br /> <br />For sale by the Superintendent of Documents, U.S. Government Printing Office <br />Washington, D.C. 20402. Price 30 cents (paper cover) <br /> <br />. <br /> <br />. <br /> <br />. <br />