000 00374nam a2200133Ia 45e0
008 181001s1961 xx 000 0 und d
100 _aHeady
245 0 _aAgricultural production function
260 _bKalyani Prak.
_c1961
300 _a667
942 _2ddc
_cBK
999 _c2258
_d2258