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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Stevens, G R
    Type: Article
    In: Palaeontology
    Volume: 7
    Date: 1965
    Page Range: 606--620
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Stevens, G R
    Type: Article
    In: Palaeontology
    Volume: 7
    Date: 1965
    Page Range: 621--629
    Publication Info: London, Palaeontological Association, 1957-
  3. By: Stevens, G R
    Type: Article
    In: Palaeontology
    Volume: 6
    Date: 1963
    Page Range: 690--698
    Publication Info: London, Palaeontological Association, 1957-