003470000a22001210004500060000800000082001200008100002200020245006000042260003400102260000900136300000800145650007200153  a100  a631 BIM  aBimal chandra mal  aIntroduction to soil and water conservation engineering  aNew Delhi, Kalyani Publishers  c1994  a429  aSoil, Water conservation/ Agriculture engineering/ Crop production/