000 00333nam a2200121Ia 4500
008 151018s9999 xx 000 0 und d
100 _aYang, W. Y.
245 _aFarm management investigations for agricultural improvement
260 _c1952
300 _av 36p.
500 _aFAO agricultural development no- 80
942 _cFAO
_2udc
999 _c25813
_d25813