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  1. By: Vallely, Andrew C - Gallardo, Robert J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 133
    Issue: 4
    Date: 2013
    Page Range: 319--321
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Vallely, Andrew C - Gallardo, Robert J - Ascher, John S.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 130
    Date: 2010
    Page Range: 52--60
    Publication Info: London, British Ornithologists' Club, 1893-