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  1. By: Burt, William Henry,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 46
    Date: 1933
    Page Range: 37--38
    Publication Info: Washington Biological Society of Washington
  2. By: Burt, William Henry,
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 47
    Date: 1934
    Page Range: 107--108
    Publication Info: Washington Biological Society of Washington