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  1. By: Pennsylvania. Ornithologist. - Warren, Benjamin Harry,
    Publication info: Harrisburg :E.K. Meyers, State Printer,1888.
    Holding Institution: University of California Libraries (archive.org)
  2. By: Pennsylvania. Ornithologist. - Warren, Benjamin Harry,
    Edition: 2d ed.
    Publication info: Harrisburg,E. K. Meyers, state printer,1890.
    Holding Institution: University of California Libraries (archive.org)
  3. By: Pennsylvania. Ornithologist. - Warren, Benjamin Harry,
    Publication info: Harrisburg,E.K. Meyers, State Printer,1888.
    Holding Institution: Smithsonian Libraries
  4. By: Pennsylvania. Ornithologist. - Warren, Benjamin Harry,
    Edition: 2d ed., rev. and augm.
    Publication info: Harrisburg,E.K. Meyers, State Printer,1890.
    Holding Institution: Smithsonian Libraries