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  1. By: Andrews, Henry N - Gensel, Patricia G - Forbes, William H
    Type: Article
    In: Palaeontology
    Volume: 17
    Date: 1974
    Page Range: 387--408
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Gensel, Patricia G - Chaloner, W. G. (William Gilbert) - Forbes, William H
    Type: Article
    In: Palaeontology
    Volume: 34
    Date: 1991
    Page Range: 149--168
    Publication Info: London, Palaeontological Association, 1957-