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  1. 1
    Biological nitrogen fixation and sustainability of tropical agriculture : proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 24-28 September 1990 /

    Biological nitrogen fixation and sustainability of tropical agriculture : proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixa...

    Published 1992
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  2. 2
    Nitrogen fixation in tropical cropping systems /

    Nitrogen fixation in tropical cropping systems / by Giller, K. E.

    Published 1991
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  3. 3
    Nitrogen fixing trees for fodder production : proceedings of an international workshop /

    Nitrogen fixing trees for fodder production : proceedings of an international workshop /

    Published 1998
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