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  1. By: Yerbury, J. W.
    Type: Article
    In: Ibis
    Volume: 2
    Series: 7
    Issue: 1
    Date: 1896
    Page Range: 13--41
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Yerbury, J. W.
    Type: Article
    In: The Irish naturalist
    Volume: 11
    Date: 1902
    Page Range: 74--93
    Publication Info: Dublin, Eason & Son, Ltd, 1892-