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Upright bird: Chang Nai-chi Collection.
J.T. Tai & Co., New York, 1963.
Bottle horn dragon: acquired prior to 1966.
Recumbent bird: A.W. Bahr Collection, Weybridge, 1963.
Upright bird: Archaic Chinese Jades, The University Museum, Philadelphia, February 1940, pl. VI, no. 107.