00279nam a2200109 a 450000500170000002000150001708200170003210000210004924500260007026000450009630000280014120251203110046.0  a0486607550  a620.112bHAR  aHartog, J.P. Den  aStrength of materials  aNew YorkbDover Publications, Inc.c1977  aviii, 323p.c23 cm P.B.