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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Behring, Emil von,
    Publication info: Leipzig, G. Thieme, 1893
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Behring, Emil von,
    Publication info: New York, C. Bischoff & Co, [1903-1906?]
    Holding Institution: UMass Amherst Libraries (archive.org)