000			00356nam a2200121Ia 4500
008			151015s9999 xx 000 0 und d
100			_aYang, W. Y.
245			_aMethods of farm management investigations _bfor improving farm productivity
260			_c1958
300			_aix 228p.
500			_aFAO agricultural development paper no- 64
942			_cFAO _2udc
999			_c24051 _d24051