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  1. Correspondence : Ascherson (Paul) and Engelmann (George), 1862-1876.
    By: Ascherson, Paul,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  2. Kufra : reise von Tripolis nach der oase Kufra, ausgeführt in auftrage der Afrikanischen Gesellschaft in Deutschland /
    By: Rohlfs, Gerhard, - Ascherson, Paul,
    Publication info: Leipzig :F.A. Brockhaus,1881.
    Holding Institution: University of California Libraries (archive.org)
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  3. Synopsis der mitteleuropaïschen flora /
    By: Ascherson, Paul, - Graebner, Paul,
    Publication info: Leipzig :W. Engelmann,1896-
    Holding Institution: University of California Libraries (archive.org)
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  4. Synopsis der Mitteleuropaïschen flora /
    By: Ascherson, Paul, - Graebner, Paul,
    Publication info: Leipzig :verlag von Wilhelm Engelmann,1896-
    Holding Institution: University of Toronto - Gerstein Science Information Centre
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