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  1. By: Perrygo, Watson M., - Cole, James
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  2. By: Perrygo, Watson M., - Cole, James
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection