00293nam a2200109 a 450000500170000002000150001708200190003210000260005124500490007726000420012630000150016820251203091721.0  a0136623131  a552.1,bD, PHI  aPhilpotts, Anthony R.  aPetrography of igneous and metamorphic rocks  aEnglewood CliffsbPrentice Hallc1989  a178p, 26cm