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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br />STEW ART L. UDALL, Secretary <br />GEOLOGICAL SURVEY <br /> <br />William T. Pecara, Directar <br /> <br />First printing 1961 <br />Second printing- 1968 <br /> <br />UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON, 1968 <br /> <br />For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 <br /> <br />. <br /> <br />. <br /> <br />. <br />