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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Freeman, Eric F
    Type: Article
    In: Palaeontology
    Volume: 25
    Date: 1982
    Page Range: 471--484
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Freeman, Eric F
    Type: Article
    In: Palaeontology
    Volume: 22
    Date: 1979
    Page Range: 135--166
    Publication Info: London, Palaeontological Association, 1957-