004060000a22001570004500060000800000082002300008100002000031100001500051245004300066260002000109260000900129300000700138320002000145490002500165650005800190  a100  a633.009 541 62 CHA  aChaturvedi, M D  aUppal, B N  aStudy in shifting cultivation of Assam  aNew Delhi, ICAR  c1953  a22  aChaturvedi, M D  aICAR research series  aShifting cultivation-Assam/ Soil erosion/ Field crops