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  1. The book of nature study /
    By: Farmer, J. B. (John Bretland),
    Publication info: London :Caxton Pub. Co.,[1908?]-1909.
    Holding Institution: University of Toronto - Gerstein Science Information Centre
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  2. The book of nature study,
    By: Farmer, J. B. (John Bretland),
    Publication info: London,Caxton publishing company[1908?]-1909.
    Holding Institution: University of California Libraries (archive.org)
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  3. The mutation theory; experiments and observations on the origin of species in the vegetable kingdom,
    By: Vries, Hugo de, - Darbishire, A. D. (Arthur Dukinfield), - Farmer, J. B. (John Bretland),
    Publication info: Chicago,Open Court Pub. Co.,1909-10.
    Holding Institution: NCSU Libraries (archive.org)
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  4. The mutation theory; experiments and observations on the origin of species in the vegetable kingdom,
    By: Vries, Hugo de, - Darbishire, A. D. (Arthur Dukinfield), - Farmer, J. B. (John Bretland),
    Publication info: Chicago,Open Court Publishing Company; [etc., etc.]1909-10.
    Holding Institution: MBLWHOI Library
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  5. Plant life,
    By: Farmer, J. B. (John Bretland),
    Publication info: New York,H. Holt[1913]
    Holding Institution: University of California Libraries (archive.org)
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  6. Plant life,
    By: Farmer, J. B. (John Bretland),
    Publication info: New York,H. Holt and company ; [etc., etc.,1913]
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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