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  1. By: Pitt, Leslie John - Thomas, Henry Dighton
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 18
    Date: 1969
    Page Range: 29--38
    Publication Info: London, BM(NH),
  2. By: Thomas, Henry Dighton - Davis, Arthur George
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 1
    Date: 1949
    Page Range: 1--19
    Publication Info: London, BM(NH),