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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Robertson, Charles, - Burkill. I. H. (Isaac Henry),
    Publication info: 1896
    Holding Institution: University of Alberta Library
  2. By: Robertson, Charles,
    Publication info: St. Louis, Academy of Science of St. Louis, 1900
    Holding Institution: Cornell University Library
  3. By: Robertson, Charles,
    Publication info: Carlinville, Illinois,
    Holding Institution: University Library, University of Illinois Urbana Champaign