000 00281nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aNai-ch-iang
245 0 _aEssential of chemical fertilizer use in PRC
260 _bNTIS
260 _c1978
365 _b14.00
942 _cBK
999 _c205442
_d205442