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  1. By: Francis, Godfrey Herbert
    Type: Article
    In: Bulletin of the British Museum (Natural History) Mineralogy
    Volume: 1
    Issue: 5
    Date: 1958-02
    Page Range: 123--162
    Publication Info: London, BM(NH),
  2. By: Francis, Godfrey Herbert
    Type: Article
    In: Bulletin of the British Museum (Natural History) Mineralogy
    Volume: 1
    Issue: 6
    Date: 1964
    Page Range: 165--199
    Publication Info: London, BM(NH),