00491nam a2200181 a 450000100080000000500110000800800410001910000120006024500620007226000350013430000100016952000280017965000230020765000250023065000160025565000200027165300180029111561442019-09-10       1969    bl uuuu     u0uu1 u    #d1 aLAL, H.  aImplements use efficiency as affected by various factors.  aIowa, Iowa College Pressc1969  a15 p.  aRevisão de literatura.  aTillage implements  aImplemento agrícola  aMulticultor  aTração Animal  aForça animal