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  1. 1
    The fixation of atmospheric nitrogen /
    Book
    by Knox, Joseph
    Published 1921
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  2. 2
    The soil nitrogen index and its calibration with crop performance to improve fertilizer efficiency on arable soils /
    Book
    by Robinson, J. B. D.
    Published 1975
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  3. 3
    Nitrogen and phosphorus control by two facilities in Florida /
    Government Document Book
    by Comfort, Tom
    Published 1979
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  4. 4
    Dynamic performance of slurry biological reactor systems for nitrification and dentrification [i.e. denitrification] /
    Book
    by Roberts, John
    Published 1976
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  5. 5
    Nitrification inhibition in the treatment of sewage /
    Book
    by Richardson, Mervyn
    Published 1985
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