Books by Songding Xu:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Xu, Songding, fl. 1887: Xu xue cong ke (Haining Xu shi Gu jun ge, 1887), also by Guangqi Gu, Kejun Yan, Renhu Cao, Zhuan Chen, and Jishi Sun (page images at HathiTrust)
Find more by Songding Xu at your library, or elsewhere.