00526nam a2200145Ia 4500008004100000040001700041082002500058100001400083110004500097245008900142260002000231300001400251440004600265650006900311190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta631.107bF686M  aYang, W Y  aFood and Agriculture Organization (Rome) 0aMethods of farm management investigationsbfor improving farm productivitycW Y Yang  aRomebFAOc1958  aix, 228p.  aFAO agricultural development paper; no.64  aFarm management; Agricultural surveys; Agricultural productivity