00285nam a2200109Ia 450000500170000000800410001708200140005810000180007224500330009026000440012330000080016720260224040958.0260224s9999||||xx |||||||||||||| ||und||  a631.3 KEP  aKepner, R.A.  0aPrinciples of farm machinery  aWestport, Conn : AVI Publicationsc1978  a527