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  1. De genere Heteropteryge.
    By: Niedenzu, Franz,
    Publication info: Braunsberg,Heyne's Buchdruckerei,1903.
    Contributed by: Field Museum Library
    BHL Collections: Field Museum Library
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  2. Handbuch für botanische Bestimmungsübungen.
    By: Niedenzu, Franz,
    Publication info: Leipzig,Engelmann,1895.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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