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  1. By: Beavers, Randell A. - Delaney, Dale J. - Leahy, C W - Oatman, G F
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 111
    Date: 1991
    Page Range: 77--90
    Publication Info: London, British Ornithologists' Club, 1893-