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  1. By: Mcgowan, R Y - Massa, B
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 64--65
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Mcgowan, R Y - Pritchard, J S
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 6--7
    Publication Info: London, British Ornithologists' Club, 1893-