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  1. The Characeae of America /
    By: Allen, Timothy Field,
    Publication info: Boston :S.E. Cassino,[1880]
    Holding Institution: MBLWHOI Library
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  2. The Characeae of America /
    By: Allen, Timothy Field,
    Publication info: New York :[s.n.],1888-1896.
    Holding Institution: MBLWHOI Library
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  3. Correspondence : Allen (Timothy) and Engelmann (George), 1860-1884.
    By: Allen, Timothy Field,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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