000 00321nam a2200133Ia 4500
008 230108s9999 xx 000 0 und d
100 _a"Zandstra HG, et al."
245 0 _aMethodology for on-Farm Cropping Systems Research
260 _bIRRI
260 _c1981
365 _b0.00
650 _aAgronomy
942 _cBK
999 _c249496
_d249496