This archive from the Smithsonian Institution has photos of Carlisle, including photos of students and the campus. The photographs include portraits, sports teams, and students working.
Source: John N. Choate photographs of Carlisle Indian School circa 1879-1902. Smithsonian Institution. http://collections.si.edu/search/results.htm?q=set_name%3A%22John+N.+Choate+photographs+of+Carlisle+Indian+School+circa+1879-1902%22&start=0