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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />CECIL D. ANDRUS, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />W. A. Radlinski, Acting Director <br /> <br />First printing 1968 <br /> <br />Second printing 1969 <br /> <br />Third printing 1978 <br /> <br />UNITED STATES GOVERNMENT PRINTING OFFICE: 1968 <br /> <br />For sale by the Branch of Distribution, U.S. Geological Survey, <br />1200 South Eads Street, Arlington, VA 22202 <br /> <br />. <br /> <br />. <br /> <br />. <br />