Books by Henri-Louis Dupray:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Dupray, Henri-Louis, 1841-1909: Histoire de l'École polytechnique (Baudry et cie, 1887), also by G. Pinet and Henri Thiriat (page images at HathiTrust)
Find more by Henri-Louis Dupray at your library, or elsewhere.