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  1. By: Ericson, Per G. P. - Amarilla, Luis Alberto
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 60--67
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Ericson, Per G. P.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 19--26
    Publication Info: London, British Ornithologists' Club, 1893-