00232nam a22001097a 4500003000400000020001800004082001600022100001800038245003400056260002400090300000800114SGT  a81-239-0977-2  a631.3bP05K  aKEPNER, R.A.   aPRINCIPLES OF FARM MACHINERY   aDELHIbC.B.S.c2005  a527