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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Burgess, Neil D. - De Klerk, Helen - Fjeldså, Jon - Crowe, Tim - Rahbek, Carsten
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 4
    Issue: 2
    Date: 1997-09
    Page Range: 93--98
    Publication Info: Cambridge, African Bird Club, 1994-