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  1. By: Chapman, Alfred Crawhall
    Type: Article
    In: Ibis
    Volume: 3
    Series: 5
    Issue: 2
    Date: 1885
    Page Range: 158--184
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Chapman, Alfred Crawhall
    Type: Article
    In: Ibis
    Volume: 6
    Series: 6
    Issue: 3
    Date: 1894
    Page Range: 339--351
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,