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  1. By: Hough, Walter, - Gates, Peter Goddard. - United States National Museum.
    Holding Institution: University of California Libraries (archive.org)
  2. By: Hough, Walter,
    Publication info: Washington,1895.
    Holding Institution: University of California Libraries (archive.org)
  3. By: Hough, Walter,
    Publication info: Washington, D.C. :Gibson Bros., printers,1906.
    Holding Institution: Smithsonian Libraries