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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />ROGERS C. B. MORTON, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />V. E. McKelvey, Director <br /> <br />Libzary of Congress catalog-card No. '74-600042 <br /> <br />For sale by the Superintendent of Documents, U. S. Government Printing Office <br />Washington, D. C. 20402 ~ Price $2.35 (paper cover) <br />Stock Number 2401-02483 <br />