Carvallow, Carlos, "Report of Two Cases of Suicide", in Otis, George Alexander, ed., A Report of Surgical Cases Treated in the Army of the United States from 1865 to 1871, Washington, Government Printing Office, no date.

On. www.archive.org

At Jefferson, Texas, December 31, 1869, Lieutenant E. P. Colby, llth United States Infantry,
aged 24, committed suicide. He used a small Derringer pistol.