00415nam a22001457a 4500003000400000008004100004082001700045100001900062245007600081260004500157300000900202502001800211650002900229650001100258OSt260527b        |||||||| |||| 00| 0 eng d  a631.36bA45E  aKumar, Ambrish  aEconomics and Performance of Tractor and Powertiller Operated Threshers  aPusa, SamastipurbRAU, Dept of CAEc1990  a69P.  bB.Tech.d1990  aAgricultural Engineering  aB.Tech