00249nam a2200109Ia 4500008004100000041000800041082002100049100001300070245003900083260000900122300000800131211209s1978    xx            000 0 und d  aeng  a620.1123 N78 ARC  aARCHIE H  aMECHANICS OF MATERIALS S1 VERSION   c1978  a752