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  1. On the sources of the nitrogen of vegetation : with special reference to the question whether plants assimilate free or uncombined nitrogen / by John Bennet Lawes, Joseph Henry Gilbert and Evan Pugh.
    By: Lawes, J. B. - Gilbert, Joseph Henry, - Pugh, Evan,
    Publication info: London :Printed by Taylor and Francis,1862.
    Contributed by: The LuEsther T Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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