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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Holdsworth, B K
    Type: Article
    In: Palaeontology
    Volume: 8
    Date: 1965
    Page Range: 226--230
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Holdsworth, B K
    Type: Article
    In: Palaeontology
    Volume: 9
    Date: 1966
    Page Range: 319--329
    Publication Info: London, Palaeontological Association, 1957-