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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Varker, W. John
    Type: Article
    In: Palaeontology
    Volume: 10
    Date: 1967
    Page Range: 124--141
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Higgins, A C - Varker, W. John
    Type: Article
    In: Palaeontology
    Volume: 25
    Date: 1982
    Page Range: 145--166
    Publication Info: London, Palaeontological Association, 1957-