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  1. 1
    Management of biological nitrogen fixation for the development of more productive and sustainable agricultural systems : extended versions of papers presented at the Symposium on Biological Nitrogen Fixation for Sustainable Agriculture at the 15th Congress of Soil Science, Acapulco, Mexico, 1994 /
    Conference Proceeding Bog
    Udgivet 1995
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  2. 2
    Major biological issues resulting from anthropogenic disturbance of the nitrogen cycle : proceedings of the Third New Phytologist Symposium, University of Lancaster, Lancaster UK, September 1997 /
    Conference Proceeding Bog
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