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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hans
    Type: Article
    In: Ibis
    Volume: 5
    Series: 6
    Issue: 2
    Date: 1893
    Page Range: 207--210
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  2. By: Hans - Berlepsch, Graf
    Type: Article
    In: Ibis
    Volume: 4
    Series: 7
    Issue: 1
    Date: 1898
    Page Range: 60--67
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,
  3. By: Hans - Von Berlepsch, Graf - Stolzmann, Jean
    Type: Article
    In: Ibis
    Volume: 6
    Series: 6
    Issue: 1
    Date: 1894
    Page Range: 109--112
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,