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  1. By: Hankin, E H
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1920
    Date: 1920
    Page Range: 467--474
    Publication Info: London Academic Press, [etc.] 1833-1965
  2. By: Hankin, E H
    Type: Article
    In: The Auk
    Volume: 32
    Date: 1915
    Page Range: 245--247
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-