000			00262nam a2200097 4500
100			_aBulman, O.M.B.
245			_aGeological Magazine, vol.98, (1-6) _cBulman, O.M.B.
260			_aUniversity of Chicago _c1961
260			_aUniversity of Chicago _c1961
942			_cCR
999			_c335223 _d335223