000			00317nam a2200121Ia 4500
008			140317s9999 xx 000 0 und d
082			_a631.5
100			_aMukhopadhyay,Sudhin K.
245			_aSources of variation in agricultural productivity.
260			_aDelhi _bMacmillan _c1976
300			_a119
942			_2ddc _cBK
999			_c8698 _d8698