Penley, Aaron,
"1. Lieut. Philip J. Maximilian, Mad. Engrs. 2. Lieut. William M. Campbell, Bom. Engrs. Lieut. Ross Thompson, Madras Engineers"
(1855).
Prints, Drawings and Watercolors from the Anne S.K. Brown Military Collection.
Brown Digital Repository. Brown University Library.
https://repository.library.brown.edu/studio/item/bdr:zrqzvd9d/