00306nam a2200109Ia 4500082002300000100002400023245009700047260002700144300001500171500000500186700000500191  a338.10954bM953.SY  aMukhopadhyay, S. K.  aSources of varition in Agricultural productivityba cross section time-series study in India  aDelhibMacmillanc1976  axii, 121p.  a  a