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  1. By: Tweeddale, Arthur Hay,‏ ‎ Marquis of, - S., Viscount Walden P Z
    Type: Article
    In: Ibis
    Volume: 3
    Series: 3
    Issue: 3
    Date: 1873
    Page Range: 296--321
    Publication Info: [London], Published for the British Ornithologists' Union by Academic Press,