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  1. By: Giesenhagen, Karl Friedrich Georg,
    Publication info: Leipzig :B.G. Teubner,1902.
    Holding Institution: University of California Libraries (archive.org)
  2. By: Giesenhagen, Karl Friedrich Georg,
    Publication info: Jena,G. Fischer,1901.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden