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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gadow, H
    Type: Article
    In: Ibis
    Volume: 4
    Series: 7
    Issue: 1
    Date: 1898
    Page Range: 42--46
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Gadow, H
    Type: Article
    In: Ibis
    Volume: 4
    Series: 9
    Issue: 1
    Date: 1910
    Page Range: 47--53
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,