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  1. By: Clark, Roger N. (Biologist)
    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. (Biologist)
    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. (Biologist)
    Type: Article
    In: American malacological bulletin
    Volume: 15
    Date: 1999
    Page Range: 33--46
    Publication Info: [Hattiesburg, Miss.?], [American Malacological Union], 1983-
  4. By: Clark, Roger N. (Biologist)
    Type: Article
    In: American malacological bulletin
    Volume: 25
    Issue: 1
    Date: 2008
    Page Range: 77--86
    Publication Info: [Hattiesburg, Miss.?], [American Malacological Union], 1983-