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  1. By: Anderson, M. M. - Boucot, Arthur James - Johnson, J G
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 18
    Date: 1969
    Page Range: 105--163
    Publication Info: London, BM(NH),
  2. By: Anderson, M. M. - Boucot, A. J. (Arthur James), - Johnson, J G
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 18
    Date: 1969
    Page Range: 107--163
    Publication Info: London, BM(NH),