00261nam a2200097Ia 4500008004100000041000800041100002700049245004000076260003900116300000800155211209s1962    xx            000 0 und d  aeng  aSPENCER, EDGAR WINSTON  aBASIC CONCEPTS OF PHYSICAL GEOLOGY   aNEW DELHIbOXFORD & IBH PUB.c1962  a467