Carved during the Xianqing reign of Gaozhong in early Tang Dynasty, the medical recipes from Longmen Grottoes didn't give the source of its literatures cited, which is a puzzle for thousand of years.
刻于唐初高宗时期的洛阳龙门石窟药方，并未标注文献来源，千余年来龙门药方的文献来源一直是个谜。
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