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  1. By: Gill, E Leonard
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1923
    Date: 1923
    Page Range: 19--40
    Publication Info: London Academic Press, [etc.] 1833-1965
  2. By: Gill, E Leonard
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 11
    Series: 9
    Issue: 64
    Date: 1923
    Page Range: 465--472
    Publication Info: London Taylor and Francis, Ltd