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  1. By: Abbass, Houssein Loutfy
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 7
    Date: 1962
    Page Range: 173--196
    Publication Info: London, BM(NH),
  2. By: Abbass, Houssein Loutfy
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 23
    Date: 1973
    Page Range: 103--175
    Publication Info: London, BM(NH),