000 00389nam a2200145Ia 4500
008 170101s1962 xx 000 0 und d
082 _a633.1 J50G
100 _aJOHNSON, D. Gale
245 0 _aGrain yields and the American food supply an analysis of yield changes possibilities
260 _bChicago
_c1962
300 _a146p
650 _aGRAINS
653 _aGRAINS
942 _2ddc
_cB
999 _c16070
_d16070