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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wall, David
    Type: Article
    In: Palaeontology
    Volume: 10
    Date: 1967
    Page Range: 95--123
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Wall, David - Downie, Charles
    Type: Article
    In: Palaeontology
    Volume: 5
    Date: 1963
    Page Range: 770--784
    Publication Info: London, Palaeontological Association, 1957-