00463nam a22001577a 4500003000400000008004100004082001800045100001900063245011300082260004100195300000900236650002700245650001200272650001100284650001000295OSt250303b        |||||||| |||| 00| 0 eng d  a338.109bB55S  aBirendra Kumar  aStudy on Comparative Economics of Tractor and Bullock Operated Farms (District, Patna) / cby Birendra Kumar  a.- Dholi, Muzaffarpurb: TCAc, 1976  a74p.  aAgricultural Economics  aTractor  aThesis  aM.Sc.