00459nam a22001457a 4500008004100000040005500041080002500096245006600121260006100187300001000248650001200258653001400270942001200284999001700296230525b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a553''1905/1980''bM1  aEconomic geology, seventy-fifth anniversary volume, 1905-1980  aTexas: bThe Economic Geology Publishing Company, c1981  a964p.  aGeology  a Economic  2udccBK  c34435d34435