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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
    BHL Collections: New York Botanical Garden
  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
    BHL Collections: New York Botanical Garden