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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ford, Trevor David
    Type: Article
    In: Palaeontology
    Volume: 8
    Date: 1965
    Page Range: 186--191
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Ford, Trevor David - Breed, William J
    Type: Article
    In: Palaeontology
    Volume: 16
    Date: 1973
    Page Range: 535--550
    Publication Info: London, Palaeontological Association, 1957-