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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Zhang, Xi-Guang - Clarkson, E. N. K. (Euan Neilson Kerr),
    Type: Article
    In: Palaeontology
    Volume: 33
    Date: 1990
    Page Range: 911--932
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Zhang, Xi-Guang - Clarkson, E. N. K. (Euan Neilson Kerr),
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 785--806
    Publication Info: London, Palaeontological Association, 1957-