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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Blaauw, P E
    Type: Article
    In: Ibis
    Volume: 1
    Series: 11
    Issue: 3
    Date: 1919
    Page Range: 454--456
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Blaauw, P E
    Type: Article
    In: Ibis
    Volume: 6
    Series: 9
    Issue: 4
    Date: 1912
    Page Range: 657--659
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,