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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ivy, Robert Henry,
    Publication info: Philadelphia, Saunders, 1911.
    Holding Institution: Columbia University Libraries (archive.org)
  2. By: Ivy, Robert Henry,
    Edition: 2d ed., thoroughly rev.
    Publication info: Philadelphia and London, W. B. Saunders company, 1917.
    Holding Institution: Columbia University Libraries (archive.org)
  3. By: Haagner, Alwin Karl, - Ivy, Robert Henry,
    Edition: 3rd & rev. ed.
    Publication info: Cape Town, T.M. Miller [n.d.]
    Holding Institution: American Museum of Natural History Library