000			00237nam a2200097 4500
999			_c334389 _d334389
082			_a549 _bHEI.M
100			_aHeinrich, E.WM.
245			_aMicroscopic Petrography _cHeinrich, E.WM.
260			_aNew York _c1956 _bMc Graw Hill
942			_cBK