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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Perrygo, Watson M., - Deignan, H. G. (Herbert Girton), - Rohwer, Gregor
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  2. By: Perrygo, Watson M., - Deignan, H. G. (Herbert Girton), - Rohwer, Gregor
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  3. By: Perrygo, Watson M., - Rohwer, Gregor
    Publication info: 1939
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection