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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hellriegel, Hermann, - Wilfarth, Hermann,
    Publication info: Nancy, Berger-Levrault, 1891
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  2. By: Hellriegel, Hermann, - Wilfarth, Hermann,
    Publication info: Berlin, Buchdruckerei der "Post" Kayssler, 1888
    Holding Institution: NCSU Libraries (archive.org)