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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Rasmussen, P C - López H., Nancy.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 108
    Date: 1988
    Page Range: 154--159
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Rasmussen, P C - Wardill, J. C. - Lambert, F R - Riley, J
    Type: Article
    In: Forktail
    Volume: 16
    Date: 2000
    Page Range: 69--81
    Publication Info: Oxford,
  3. By: Rasmussen, P C - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 78--87
    Publication Info: Oxford,