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  1. By: Simson, Frank B
    Type: Article
    In: Ibis
    Volume: 2
    Series: 5
    Issue: 3
    Date: 1884
    Page Range: 271--275
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Simson, Frank B
    Type: Article
    In: Ibis
    Volume: 6
    Series: 4
    Issue: 1
    Date: 1882
    Page Range: 84--95
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,