TY - GEN AU - Ajanaba, A AU - Dest, P J TI - Biological Nitrogen fixation in farming systems proceedings of the symposium held at the international institute of tropical agriculture SN - 0471994995 U1 - 631.8470913 AYA CY - Chichester, John Wiley & Sons KW - Agriculture - Tropics - Congresses / Nitrogen fixation - congresses ER -