00313nam a22000977a 4500003000400000008004100004100004400045245007400089260004400163300000800207OSt231030b        |||||||| |||| 00| 0 eng d  aDirectorate  of Agriculture West Bengal  aStudy on farm management and cost of production of crops, west Bengal  bCalcutta Directorate of Agric.c1973-74  a480