Books by Yan Xu:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Xu, Yan, active 9th century-10th century: Jiaye tang cong shu. Jing bu ([s.n.], 1918), also by Chenggan Liu, Shixun Yang, Yingda Kong, and Gongyan Jia (page images at HathiTrust)
Find more by Yan Xu at your library, or elsewhere.