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  1. By: Jourdain, F. C. R. (Francis Charles Robert), - Wallis, H. M. - Ratcliff, F R
    Type: Article
    In: Ibis
    Volume: 3
    Series: 10
    Issue: 1
    Date: 1915
    Page Range: 133--169
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Wallis, H. M.
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 1897
    Date: 1897
    Page Range: 298--310
    Publication Info: London, Academic Press, [etc.], 1833-1965