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  1. By: Perrygo, Watson M.,
    Publication info: 1929-1930
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  2. By: Perrygo, Watson M.,
    Publication info: 1928-1929
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  3. By: Perrygo, Watson M.,
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  4. By: Perrygo, Watson M.,
    Publication info: 1937
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  5. By: Perrygo, Watson M.,
    Publication info: 1937
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  6. By: Perrygo, Watson M.,
    Publication info: 1936
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  7. By: Perrygo, Watson M., - Cole, James
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  8. 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
  9. By: Perrygo, Watson M., - Wheeler, Charles L.
    Publication info: 1939
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  10. By: Perrygo, Watson M., - Lingebach, John Carleton
    Publication info: 1937
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  11. By: Perrygo, Watson M., - Schaefer, Henry R.
    Publication info: 1937
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  12. By: Perrygo, Watson M.,
    Publication info: 1936
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  13. By: Perrygo, Watson M., - Lingebach, John Carleton
    Publication info: 1936
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  14. By: Perrygo, Watson M., - Wetmore, Alexander,
    Publication info: 1928-1929
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  15. By: Perrygo, Watson M., - Wetmore, Alexander,
    Publication info: 1930
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  16. By: Perrygo, Watson M., - Cole, James
    Publication info: 1938
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  17. 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
  18. By: Perrygo, Watson M., - Hoyt, John Southgate Yeaton
    Publication info: 1940
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  19. By: Perrygo, Watson M., - Lingebach, John Carleton - Schaefer, Henry R.
    Publication info: 1937
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  20. By: Perrygo, Watson M., - Lingebach, John Carleton
    Publication info: 1936
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  21. By: Perrygo, Watson M., - Poole, W. M.
    Publication info: 1928-1929
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  22. By: Perrygo, Watson M., - Rohwer, Gregor
    Publication info: 1939
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  23. By: Perrygo, Watson M., - Wheeler, Charles L.
    Publication info: 1939
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  24. By: Perrygo, Watson M.,
    Publication info: 1936-1940
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection
  25. By: Perrygo, Watson M.,
    Publication info: 1929
    Holding Institution: Smithsonian Institution Archives
    BHL Collections: Smithsonian Field Books collection