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  1. Synopsis der mitteleuropaïschen Flora, von Paul Ascherson und Paul Graebner.
    By: Ascherson, Paul Friedrich August, - Graebner, Paul,
    Publication info: Leipzig,W. Engelmann,1896/98-
    Contributed by: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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