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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Lotsy, Johannes Paulus,
    Publication info: Jena G. Fischer 1907-
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Lotsy, Johannes Paulus,
    Publication info: Jena, G. Fischer, 1907-
    Holding Institution: NCSU Libraries (archive.org)