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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Langkavel, Bernhard August,
    Publication info: Berlin, F. Berggold, 1866
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  2. By: Martens, Eduard von, - Langkavel, Bernhard August,
    Publication info: Berlin, F. Berggold, 1871
    Holding Institution: Smithsonian Libraries and Archives