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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Berg, Arnoud B. van den - Bosman, Cecilia A. W.
    Type: Article
    In: Forktail
    Volume: 1
    Date: 1986
    Page Range: 7--13
    Publication Info: Oxford,
  2. By: Kirwan, Guy M - Atkinson, Phillip W - Berg, Arnoud B. van den - Shirihai, Hadoram
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 13
    Issue: 2
    Date: 2006-08
    Page Range: 136--146
    Publication Info: Cambridge, African Bird Club, 1994-