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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, Andrew L A - Lennon, Christopher D
    Type: Article
    In: Palaeontology
    Volume: 33
    Date: 1990
    Page Range: 453--485
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Johnson, Andrew L A
    Type: Article
    In: Zitteliana
    Volume: 11
    Date: 1984
    Page Range: 3--235
    Publication Info: Altötting [etc.], Komissionsverlag Geiselberger [etc.],