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  1. 1
    Limitations and potentials for biological nitrogen fixation in the tropics : [proceedings of a conference on limitations and potentials for biological nitrogen foxation in the tropics, held in Brasilia, Braxil, July 18-22, 1977] /

    Limitations and potentials for biological nitrogen fixation in the tropics : [proceedings of a conference on limitations and potentials for biological nitrogen foxation in the trop...

    Gepubliceerd in 1978
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  2. 2
    Biological nitrogen fixation in farming systems of the Tropics : based on papers presented at a symposium held at the International Institute of Tropical Agriculture, Ibadan, Nigeria, in October 1975 /

    Biological nitrogen fixation in farming systems of the Tropics : based on papers presented at a symposium held at the International Institute of Tropical Agriculture, Ibadan, Niger...

    Gepubliceerd in 1977
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