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<br />i <br />; <br /> <br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />WALTER J. HICKEL, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />William T. Pecora, Director <br /> <br />UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON, 1969 <br /> <br />For sale by the Superintendent of Documenh, U.S. Government Printing Office <br />Washington; D.C. 20402 - Price 70 cents <br /> <br />-- <br /> <br />~~-,."t_. ~ <br /> <br />-'" <br />