000			00395nam a2200145Ia 4500
008			160906s9999 xx 000 0 und d
100			_aGriliches, Zvi
245			_aHybrid corn : An exploration in the economics of technological change
260			_aU.S.A
260			_bNorthwestern University
260			_c1957
300			_aP V
440			_aVol - 25, No. 4
650			_aL S V Collection
999			_c105213 _d105213