Бань Гу
"Yiwenzhi" (), or the "Treatise on Literature", is the bibliographical section of the "Hanshu" ("Book of Han") by the Chinese historian Ban Gu (32–92 AD), who completed the work begun by his father Ban Biao. The bibliographical catalog is the last of its ten treatises, and scroll 30 of the 100 scrolls comprising the "Hanshu".