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  1. Fish skulls; a study of the evolution of natural mechanisms.
    By: Gregory, William K.
    Publication info: Laurel, Fla.,E. Lundberg,1959.
    Contributed by: Prelinger Library (archive.org)
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  2. The orders of mammals. By William K. Gregory.
    By: Gregory, William K.
    Publication info: New York,The Trustees,1910.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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