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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Stokes, Robert B
    Type: Article
    In: Palaeontology
    Volume: 19
    Date: 1976
    Page Range: 689--697
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Stokes, Robert B
    Type: Article
    In: Palaeontology
    Volume: 20
    Date: 1978
    Page Range: 805--821
    Publication Info: London, Palaeontological Association, 1957-