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By: Demey, Ron - Herroelen, Paul - Pedersen, TommyType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 120Series:Issue:Date: 2000Page Range: 154--172Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Pedersen, TommyType: ArticleIn: Bulletin of the African Bird ClubVolume: 4Series:Issue: 2Date: 1997-09Page Range: 109--110Publication Info: Cambridge, African Bird Club, 1994-Subjects: