Books by Wm. Humber:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Humber, Wm., 1821-1881: A treatise on the strength of materials (Lockwood, 1867), also by Peter Barlow and Robert Willis (page images at HathiTrust)
Find more by Wm. Humber at your library, or elsewhere.