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History of the United States Secret Service. By General L. C. Baker. Philadelphia: L. C. Baker, 1867. E608-B16
The Secret Service in the Late War. By General L. C. Baker. Philadelphia: John Potter & Co., 1874. E608-B167-S446
Nurse and Spy in the Union Army: Comprising the adventures and experiences of a woman in hospitals, camps and battlefields. By Emma E. Edmonds. Hartford: W. S. Williams; Philadelphia: Jones Bros., 1865. E608-E24
Confederate Agent: A discovery in history. By James D. Horan. New York: Crown Publishers, 1954. E608-H811-1960
The Pinkertons: The detective dynasty that made history. By James D. Horan. New York: Crown Publishers, 1968, c 1967. HV8087-P75-H62-1968
The Boy Spy: A substantially true record of secret service during the war of the rebellion. By Maj. J. O. Kerbey. Chicago: Donohue, Henneberry & Co., 1892. E608-K39
The Spy of the Rebellion: Being a true history of the spy system of the United States Army during the late rebellion. Revealing many secrets of the war hitherto not made public. Compiled from official reports prepared for President Lincoln, General McClellan and the provost-marshall-general. By Allen Pinkerton. New York: G. W. Carleton & Co., 1883. E608-P65
The Secret Service, the Field, the Dungeon and the Escape. By Albert D. Richardson. Hartford, Conn.: American Publishing Company; Philadelphia: Jones Bros. & Co., 1865. E468.9-R521