Book by category
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A Book by category (traditional Chinese: 類書) is one kind of reference book in ancient China.
- First appeared in Cao Wei for the emperor Cao Pi.
- During Song Dynasty Extensive Records of the Taiping Era and Imperial Readings of the Taiping Era,Prime Tortoise of the Record Bureau.
- During Ming Dynasty, Yongle Encyclopedia,
- Qing Dynasty,Gǔjīn Túshū Jíchéng.

