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  1. By: Hatcher, J. B. (John Bell), - Lull, Richard Swann, - Osborn, Henry Fairfield, - Marsh, Othniel Charles,
    Publication info: Washington, Govt. Print. Off, 1907
    Holding Institution: Smithsonian Libraries
    Subjects: Ceratopsia
    BHL Collections: Bone Wars Collection | Fossil Stories | Unearthed! Smithsonian Libraries' Paleo Collection
  2. By: Lull, Richard Swann, - Le Vene, Clara Mae. - Peabody Museum of Natural History.
    Publication info: New Haven, Conn, [Tuttle, Morehouse & Taylor Co.], 1933
    Holding Institution: MBLWHOI Library
    Subjects: Ceratopsia