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  1. By: Cleal, Christopher J., - Shute, Cedric H
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 46
    Issue: 2
    Date: 1991-01-31
    Page Range: 153--174
    Publication Info: London, BM(NH),
  2. By: Cleal, Christopher J., - Shute, Cedric H
    Type: Article
    In: Bulletin of the Natural History Museum. Geology series
    Volume: 51
    Date: 1995
    Page Range: 1--52
    Publication Info: Andover, Intercept,