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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Naoroji, Rishad - Forsman, Dick
    Type: Article
    In: Forktail
    Volume: 17
    Date: 2001
    Page Range: 105--108
    Publication Info: Oxford,
  2. By: Buij, Ralph, - Forsman, Dick
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 21
    Issue: 2
    Date: 2014-09
    Page Range: 141--154
    Publication Info: Cambridge, African Bird Club, 1994-