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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ahlberg, Per Erik
    Type: Article
    In: Palaeontology
    Volume: 32
    Date: 1989
    Page Range: 553--570
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Ahlberg, Per Erik
    Type: Article
    In: Palaeontology
    Volume: 35
    Date: 1992
    Page Range: 813--828
    Publication Info: London, Palaeontological Association, 1957-
  3. By: Ahlberg, Per Erik
    Type: Article
    In: Palaeontology
    Volume: 38
    Date: 1995
    Page Range: 259--285
    Publication Info: London, Palaeontological Association, 1957-