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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wellman, C. H. - Richardson, J B
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 155--193
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Edwards, D - Davies, K L - Richardson, J B - Wellman, C. H. - Axe, L.
    Type: Article
    In: Palaeontology
    Volume: 39
    Date: 1996
    Page Range: 783--800
    Publication Info: London, Palaeontological Association, 1957-