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<br />:.....~" t_ <br /> <br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />CECIL D. ANDRUS, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />H. William Menard, Director <br /> <br />Library of Congress number 79-600188 <br /> <br />For sale by the Superintendent of Documents. U.S. Government Printing Office <br />Washington, D.C. 20402 <br /> <br />Stock number 024-001-03243-1 <br />