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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Stuart, S N - van der Willigen, Tessa A.
    Type: Article
    In: Scopus
    Volume: 4
    Date: 1980
    Page Range: 56--58
    Publication Info: Nairobi, East Africa Natural History Society's Ornithological Sub-committee,
  2. By: Stuart, S N - Howell, K M - van der Willigen, Tessa A. - Geertsema, A A
    Type: Article
    In: Scopus
    Volume: 5
    Date: 1981
    Page Range: 46--50
    Publication Info: Nairobi, East Africa Natural History Society's Ornithological Sub-committee,