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  1. By: Gukney, J H
    Type: Article
    In: Ibis
    Volume: 5
    Series: 7
    Issue: 1
    Date: 1899
    Page Range: 19--42
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Gukney, J H
    Type: Article
    In: Ibis
    Volume: 5
    Series: 4
    Issue: 4
    Date: 1881
    Page Range: 547--567
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,