The American black chamber

Yardley, Herbert O. (Herbert Osborn), 1889-1958.
New York : Blue Ribbon Books, 1931.

American secret service agent.

Wilkie, Don.
New York : Frederick A. Stokes company, 1934.

Issues facing the United States Secret Service

New York : SNOVA, [2019]

The Secret service story.

Dorman, Michael, 1932-2008.
New York : Delacorte Press, [1967]

The spy of the rebellion : being a true history of the spy system of the United States Army during t

Pinkerton, Allan, 1819-1884.
Hartford, Conn. : Winter & Hatch, 1885.

The United States Secret Service Security Failures and Concerns During Obama's Presidency (with acco

New York : Nova Publishers 2016.

Who's who in the Secret Service : history's most renowned agents

Palamara, Vince, 1966- author.
Walterville, OR : Trine Day LLC, [2018]
First edition.