000 00306nam a2200109Ia 4500
008 220204s9999 xx 000 0 und d
082 _a631.82
_bBRA
100 _aVRADY, N C
245 0 _aSummary of research to increase efficiency of chemical fertilisers.
260 _aPhilippines
_bIRRI
_c1974
942 _cBK
999 _c23593
_d23593