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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Benton, Michael J., - Walker, Alick D
    Type: Article
    In: Palaeontology
    Volume: 28
    Date: 1985
    Page Range: 207--234
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Benton, Michael J., - Walker, Alick D
    Type: Article
    In: Palaeontology
    Volume: 39
    Date: 1996
    Page Range: 763--782
    Publication Info: London, Palaeontological Association, 1957-