000 00293nam a2200121Ia 4500
008 140113s9999 xx 000 0 und d
082 _a311:631.8 K6
100 _aF.A.O.
245 _aStatistics of crop responses to fertilizers
260 _a1966
_bFAO
_cRome
300 _a112
942 _cBK
999 _c56839
_d56839