000			00260nam a2200097 4500
999			_c335739 _d335739
082			_a551.8 _bSPE.I
100			_aSpencer,Edgar W.
245			_aIntroduction to the structure of the earth _cSpencer,Edgar W.
260			_aNew York _c1969 _bMc Graw Hill
942			_cBK