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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gordon, Mark E. (Mark Edward)
    Type: Article
    In: The Nautilus
    Volume: 100
    Date: 1986
    Page Range: 71--77
    Publication Info: Melbourne, Fla., etc American Malacologists, inc., etc
  2. By: Anderson, R. M. - Layzer, J B - Gordon, Mark E. (Mark Edward)
    Type: Article
    In: Brimleyana
    Volume: 17
    Date: 1991
    Page Range: 1--8
    Publication Info: [Raleigh, NC, North Carolina State Museum of Natural History], 1979-