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Laufer, Berthold (1913) “Arabic and Chinese Trade in Walrus and Narwhal Ivory”, in T'oung Pao, volume 14, , pages 315–364
Laufer, Berthold (1913) “Arabic and Chinese Trade in Walrus and Narwhal Ivory”, in T'oung Pao, volume 14, →DOI, pages 315–364