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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hentschel, Ernst,
    Publication info: Frankfurt a.M, Senckenbergische Naturforschende Gesellschaft, 1912
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Hentschel, Ernst,
    Publication info: Leipzig, Theod. Thomas, [19--]
    Holding Institution: Smithsonian Libraries and Archives