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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Matthews, S C - Sadler, Peter M. - Selwood, E B
    Type: Article
    In: Palaeontology
    Volume: 15
    Date: 1972
    Page Range: 550--568
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Sadler, Peter M.
    Type: Article
    In: Palaeontology
    Volume: 17
    Date: 1974
    Page Range: 71--93
    Publication Info: London, Palaeontological Association, 1957-