000 00284nam a2200109Ia 4500
008 140113s9999 xx 000 0 und d
100 _a"Eastrin, J.D."
245 _aPhysiological aspects of crop yield
260 _a1969
_bAmerican Soc. Agronomy
_cU.S.A.
300 _a396
942 _cBK
999 _c58331
_d58331