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  1. By: Butler, P. M. (Percy Milton), - Mills, James Richard Ewart
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 4
    Issue: 1
    Date: 1959-04
    Page Range: 1--26
    Publication Info: London, BM(NH),
  2. By: Clemens, William A. (William Alvin) - Mills, James Richard Ewart
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 20
    Issue: 3
    Date: 1971-04-28
    Page Range: 87--114
    Publication Info: London, BM(NH),