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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Watson, David Meredith Seares
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 2
    Date: 1956
    Page Range: 315--392
    Publication Info: London, BM(NH),
  2. By: Watson, David Meredith Seares
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 3
    Date: 1958
    Page Range: 233--263
    Publication Info: London, BM(NH),