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  1. By: Whittard, Walter Frederick
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 33
    Issue: 1
    Date: 1979-12-20
    Page Range: 1--69
    Publication Info: London, BM(NH),
  2. By: Whittard, Walter Frederick
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 1
    Issue: 10
    Date: 1952-10-16
    Page Range: 305--321
    Publication Info: London, BM(NH),