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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Knopf, Sigard Adolphus,
    Publication info: New York, National Tuberculosis Association, 1922
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Knopf, Sigard Adolphus,
    Edition: 7th American ed., enl. and rev.
    Publication info: New York, "The Survey,", 1913
    Holding Institution: University of Toronto - Gerstein Science Information Centre