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  1. By: Markle, Douglas F - Williams, Jeffrey T. - Olney, John E
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 96
    Date: 1983
    Page Range: 645--657
    Publication Info: Washington, Biological Society of Washington,
  2. By: Simon, David C - Markle, Douglas F
    Type: Article
    In: The Great Basin naturalist
    Volume: 57
    Issue: 2
    Date: 1997
    Page Range: 142--148
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,