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  1. By: Liversidge, R
    Type: Article
    In: Annals of the Cape provincial Museums
    Volume: 9
    Issue: 3
    Date: 1972-10-31
    Page Range: 51--63
    Publication Info: Grahamstown, South Africa, Published jointly by the Cape provincial museums at the Albany Museum, [1966]-1997
  2. By: Liversidge, R - Richardson, P - Gubb, A
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 101
    Date: 1981
    Page Range: 268--270
    Publication Info: London, British Ornithologists' Club, 1893-