BUREAU OF ECONOMIC GEOLOGY The University of Texas at Austin Austin, Texas 78712 John T. Lonsdale, Director November 1960 _Second Printing, July 1963_ _Third Printing, August 1967_ _Fourth Printing, June 1971_ _Fifth Printing, November 1973_ _Sixth Printing, April 1976_ _Seventh Printing, November 1978_ _Eighth Printing, September 1981_ _Ninth Printing, August 1984_…
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