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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Erf, Oscar, - Cunningham, O. C.,
    Edition: 2d ed.
    Publication info: Columbus, O, The authors, 1913
    Holding Institution: Library of Congress
  2. By: Erf, Oscar, - Cunningham, O. C.,
    Publication info: Columbus, O, The authors, 1911
    Holding Institution: Library of Congress
  3. By: Erf, Oscar,
    Publication info: Manhattan, Kan, Printing department, K.S.A.C, 1906
    Holding Institution: Library of Congress