00343nam a2200133 a 450000100080000000500110000800800410001902000180006010000180007824500520009625000110014826000390015930000110019813381102002-11-22       2001    bl uuuu      00u1 u    #d  a0-85199-417-21 aGILLER, K. E.  aNitrogen fixation in tropical cropping systems.  a2. ed.  aWallingford: CABI Publishingc2001  a423 p.