000			00349nam a2200109Ia 4500
008			190428s9999||||xx |||||||||||||| ||und||
100			_aHarker, A. _924811
245			_aPetrology for students: An introduction to the study of rocks under the microscope
250			_aEighth
250			_b1968. viii-283
260			_bCambridge university. Cambridge, U.K.
999			_c24544 _d24544