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  1. By: Barnes, Christopher R. (Christopher Richard), - Williams, S Henry
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 43
    Date: 1988
    Page Range: 31--39
    Publication Info: London, BM(NH),
  2. By: Williams, S Henry
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 43
    Date: 1988-04-28
    Page Range: 17--30
    Publication Info: London, BM(NH),
  3. By: Williams, S Henry - Stevens, Robert K
    Type: Article
    In: Palaeontology
    Volume: 34
    Date: 1991
    Page Range: 1--47
    Publication Info: London, Palaeontological Association, 1957-