000 00275nam a2200109Ia 4500
008 161118s2016 xx 000 0 und d
100 _aHeady,Earl O
245 0 _aResource Productivity, Returns to scal And Farm Size
260 _aU.S.A.
_c1956
300 _a208p.
942 _2ddc
999 _c4382
_d4382