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  1. By: Nelson, A - Kennedy, P B
    Type: Article
    In: Proceedings of the Biological Society of Washington.
    Volume: 19
    Date: 1906
    Page Range: 155--157
    Publication info: Washington,Biological Society of Washington
  2. By: Nelson, A - Kennedy, P B
    Type: Article
    In: Proceedings of the Biological Society of Washington.
    Volume: 19
    Date: 1906
    Page Range: 35--39
    Publication info: Washington,Biological Society of Washington