000 00312nam a2200121Ia 4500
008 140113s9999 xx 000 0 und d
082 _a631.816:633.002 K2
100 _a"Williamson, Mayle. S."
245 _aCrop Production levels and fertilizer use
260 _a1962
_bFAO
_cRome
300 _a48
942 _cBK
999 _c58291
_d58291