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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Steinheimer, Frank D - Dunn, E. R. (Emmett Reid), - Lewthwaite, Richard W
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123
    Date: 2003
    Page Range: 220--227
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Leader, Paul J - Stanton, David J. - Lewthwaite, Richard W - Martinez, Jonathan
    Type: Article
    In: Forktail
    Volume: 32
    Date: 2016
    Page Range: 41--53
    Publication Info: Oxford,
  3. By: Lei, Zhu - Yang, Xiao-Nong - Guang, Hao - Qin, Huang - Liu, Tian-Tian - Dai, Zi-Yue - Qian, Wei - Lewthwaite, Richard W - Sun, Yue-Hua
    Type: Article
    In: Forktail
    Volume: 30
    Date: 2014
    Page Range: 45--49
    Publication Info: Oxford,