00293nam a2200109Ia 450000500170000000800410001708200140005810000180007224500420009026000430013230000080017520260224040928.0260224s9999||||xx |||||||||||||| ||und||  a620.1 BEC  aBecker, R.A.  0aIntroduction to theoritical mechnaics  aLondon: Mc-Graw-Hill Book & Co. c1954  a420