000			00243nam a2200097 4500
999			_c336364 _d336364
082			_a552.1 _bWIL.P
100			_aWilliams,Howel,et al.
245			_aPetrography _cWilliams,Howel,et al.
260			_aSan Francisco _c1954 _bW.H.Freeman
942			_cBK