00296nam a2200121 a 450000500170000002000150001708200190003210000170005124500390006825000120010726000370011930000180015620251203091655.0  a0045520275  a552.4,bD, mas  aMason, Roger  aPetrology of the metamorphic rocks  a2nd ed.  aLoNew DelhionbUnwin Hymanc1990  ax, 230p, 22cm