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  1. By: Rickett, C B - De La Touche, J D - Ogilvie-Grant, W. R. (William Robert),
    Type: Article
    In: Ibis
    Volume: 2
    Series: 7
    Issue: 4
    Date: 1896
    Page Range: 489--495
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Rickett, C B - Ogilvie-Grant, W. R. (William Robert), - De La Touche, J D
    Type: Article
    In: Ibis
    Volume: 3
    Series: 7
    Issue: 4
    Date: 1897
    Page Range: 600--610
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,