The Shangshu gushi 尚書故實 "Factual evidence from ancient books"
is a collection written by the Tang period 唐 (618-907) scholar Li Chuo 李綽, about whose life not much is known. Lao Ge 勞格 says in his Langguan shizhu timing kao 郎官石柱題名考 that Li Chuo was a descendant of a family of officials and son of Li Kuanzhong 李寬中, descendant of Li Shu 李紓, who was Vice Minister of Personnel (libu shilang 吏部侍郎) and hailed from the commandery of Zhao 趙. His courtesy name was Li Jianmeng 李肩孟, and he lived during the reign of Emperor Zhaozong 唐昭宗 (r. 888-904), when he had a quarrel with Qian Yu 錢珝, Chamberlain for Ceremonials (taichang 太常) about court robes. Li Chuo is also mentioned in a stone inscription called Shengxianmiao xinggong ji 升仙廟興功記 that was allegedly compiled by him, who bore the title of a director in the Minitry of Rites (libu langzhong 禮部郎中).
The thematic range of the short Shangshu gushi is very wide. It mainly includes stories of contemporary significance, but also investigates some older affairs. It is an interesting source for the social history of the latter half of the Tang period.
It is included in the collectanea Baichuan xuehai 百川學海, Baoyantang miji 寶顏堂秘笈, Tangdai congshu 唐代叢書, Jifu congshu 畿輔叢書, Congshu jicheng 叢書集成 and Siku quanshu 四庫全書.
Source: Li Xueqin 李學勤, Lü Wenyu 呂文鬰 (1996). Siku da cidian 四庫大辭典, Changchun: Jilin daxue chubanshe, vol. 2, p. 1945.