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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)