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  1. By: Dillon, William Arthur. - Hargis, William J.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 81
    Date: 1968
    Page Range: 351--366
    Publication Info: Washington Biological Society of Washington
  2. By: Hargis, William J. - Dillon, William Arthur.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 81
    Date: 1968
    Page Range: 403--412
    Publication Info: Washington Biological Society of Washington