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  1. By: Savage, Robert Joseph Gay - Hamilton, W R
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 22
    Date: 1973
    Page Range: 513--527
    Publication Info: London, BM(NH),
  2. By: Hamilton, W R
    Type: Article
    In: Palaeontology
    Volume: 16
    Date: 1973
    Page Range: 275--281
    Publication Info: London, Palaeontological Association, 1957-