spies

Pinkerton, Allan. 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-Marshal-General. New York: G. W. Carleton & Company, Publishers, 1883.

Wilbur, Crane. I Was a Communist for the FBI. 1951.

Ames, Laurel. Nancy Whiskey. New York: Harlequin Books, 1997.

Loftis, Joseph. Doodlebug. Bloomington, IN: AuthorHouse, 2011.