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  1. By: Thomas, H Hamshaw
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 3
    Issue: 5
    Date: 1958-02-14
    Page Range: 177--190
    Publication Info: London, BM(NH),
  2. By: Thomas, H Hamshaw - Bancroft, Nellie
    Type: Article
    In: Transactions of the Linnean Society of London, 2nd series: Botany
    Volume: 8
    Issue: 5
    Date: 1913-12
    Page Range: 155--204
    Publication Info: London,