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  1. By: Unger, Frederic William,
    Publication info: Philadelphia,The John C. Winston co.,c1909
    Holding Institution: Library of Congress
  2. By: Unger, Frederic William,
    Publication info: Philadelphia, Pa.,G. A. Parker[c1909]
    Holding Institution: Library of Congress
  3. By: Unger, Frederic William,
    Publication info: Philadelphia, Pa.? :W.E. Scull,c1909
    Holding Institution: Smithsonian Libraries
  4. By: Unger, Frederic William,
    Publication info: Philadelphia? Pa.,c1909
    Holding Institution: Library of Congress
  5. By: Unger, Frederic William,
    Publication info: [Philadelphia?, PA.],c1909.
    Holding Institution: Smithsonian Libraries