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  1. By: Clark, Roger N
    Type: Article
    In: Nemouria; occasional papers of the Delaware Museum of Natural History.
    Volume: 43
    Date: 2000
    Page Range: 1--18
    Publication info: [Greenville]Delaware Museum of Natural History.
  2. By: Clark, Roger N
    Type: Article
    In: Nemouria; occasional papers of the Delaware Museum of Natural History.
    Volume: 42
    Date: 2000-10-25
    Page Range: 1--16
    Publication info: [Greenville]Delaware Museum of Natural History.
  3. By: Clark, Roger N
    Type: Article
    In: American malacological bulletin.
    Volume: 25
    Issue: 1
    Date: 2008
    Page Range: 77--86
    Publication info: [Hattiesburg, Miss.?] :[American Malacological Union],1983-