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  1. By: Riva, John
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 43
    Date: 1988
    Page Range: 221--237
    Publication Info: London, BM(NH),
  2. By: Riva, John
    Type: Article
    In: Palaeontology
    Volume: 17
    Date: 1974
    Page Range: 1--40
    Publication Info: London, Palaeontological Association, 1957-