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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Sclater, Philip Lutley, - Crowley, Philip - Pearson, H J
    Type: Article
    In: Ibis
    Volume: 5
    Series: 7
    Issue: 1
    Date: 1899
    Page Range: 115--128
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,