1. (Jeffrey Smith per Keith Wilson, July 8, 2008) Ceremonial Objects added as secondary classification.
2. (Susan Kitsoulis per Keith Wilson, April 20, 2010) Object name changed from "Disk (bi 璧)" to "Ceremonial Objects." Title changed from "Ritual disk, bI 璧" to "Disk (bi 璧)."
3. (Jeffrey Smith per Keith Wilson, April 13, 2016) Qijia culture, Northwest China.
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