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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hoffmann, Julius, - Friese, Hermann.
    Publication info: Stuttgart, Verlag für Naturkunde (Dr. Jul. Hoffmann), 1902
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  2. By: Hoffmann, Julius, - Friese, Hermann.
    Publication info: Stuttgart, Verlag für Naturkunde Sprösser & Nägele, 1904
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library