00421    a2200133   4500020001500000082001500015245007900030260002600109300002000135440004200155650000600197650004300203650004100246  a9251030189  a631.3bAGR  aAgricultural engineering in developmentbselection of machanization inputs  aRomebFAOc1990g1990  avii,105p.c30cm  aFAO agricultural services bulletin 84  aS  aTools, machinery, apparatus, equipment  aAgriculture and related technologies