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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Northcote, E M
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 101
    Date: 1981
    Page Range: 266--267
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Northcote, E M
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 102
    Date: 1982
    Page Range: 141--142
    Publication Info: London, British Ornithologists' Club, 1893-