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  1. By: Sieg, J - Winn, Richard Neil
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 91
    Date: 1979
    Page Range: 840--846
    Publication Info: Washington Biological Society of Washington
  2. By: Sieg, J - Winn, Richard Neil
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 94
    Date: 1981
    Page Range: 315--343
    Publication Info: Washington Biological Society of Washington