000 00295nam a2200097 4500
100 _aSociety for Economic Geologists
245 _aEconomic Geology, vol.56, nos.5-8
_cSociety for Economic Geologists
260 _aUniversity of Chicago
_c1961
260 _aUniversity of Chicago
_c1961
942 _cCR
999 _c335230
_d335230