00289nam a2200133Ia 4500020000900000082001100009100002700020245003200047250000800079260003300087300000800120500000900128650001800137  aNULL  a551.41  aThornbury, William D.  0aPrinciples Of Geomorphology  a2nd  aN. DelhibWiley Eastern Ltd.  a594  a1336  aGeomorphology