00261nam a2200109 a 450000500170000002000150001708200170003210000250004924500280007426000300010230000190013220251203091721.0  a0697042979  a551,bD, MON  aMontgomery, Carla W.  aFundamentals of geology  aDubuquebWm.C.Brownc1989  axiv,358p, 26cm