Hunan Library has a large collection of ancient books, including the genealogy of Hunan surnames. Two Tangkou genealogies in Taiping Cao Shi are protected as ancient books by Hunan Library. Twelve volumes of Genealogy of Cao Shi in Daping [Zixing, Hunan Province]-Eight years of the Republic of China (19 19), Sanhoutang movable type book-7 volumes-12,5-7,9 volumes.

Filino : 277/ 1978 [Qiyang, Hunan Province] Cao Shi's genealogy of Sanwu, Volume 21/(Qing) Cao and other majors-Cai Houtang's movable type book in the 24th year of Guangxu in Qing Dynasty (1898)-1volume.

File number: 277/ 1023