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  1. By: Gregory, Joseph Tracy, - Schaeffer, Bobb,
    Publication info: 1961
    Holding Institution: American Museum of Natural History Library
  2. By: Gregory, Joseph Tracy,
    Publication info: New York, N.Y, American Museum of Natural History, [1962]
    Holding Institution: American Museum of Natural History Library
  3. By: Gregory, Joseph Tracy,
    Publication info: 1962
    Holding Institution: American Museum of Natural History Library
  1. By: Gregory, Joseph Tracy, - Downs, Theodore
    Type: Article
    In: Postilla
    Volume: 8
    Date: 1951
    Page Range: 1--10
    Publication Info: New Haven, Peabody Museum of Natural History, 1950-2004
  2. By: Gregory, Joseph Tracy,
    Type: Article
    In: Postilla
    Volume: no.5
    Date: 1950
    Page Range: 1--10
    Publication Info: New Haven, Peabody Museum of Natural History, 1950-2004