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  1. By: Harper, David A T
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 43
    Date: 1988
    Page Range: 45--52
    Publication Info: London, BM(NH),
  2. By: Garassino, Alessandro - Harper, David A T
    Type: Article
    In: Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale in Milano
    Volume: 145
    Issue: 2
    Date: 2004
    Page Range: 329--336
    Publication Info: Milano, Società Italiana di Scienze Naturali ; Museo Civico di Storia Naturale in Milano,
  3. By: Hanken, Nils-Martin - Harper, David A T
    Type: Article
    In: Palaeontology
    Volume: 28
    Date: 1985
    Page Range: 243--254
    Publication Info: London, Palaeontological Association, 1957-
  4. By: Harper, David A T - Mitchell, William Ian - Owen, Alan W - Romano, Michael
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 38
    Date: 1985
    Page Range: 287--308
    Publication Info: London, BM(NH),