Digital Maine Library https://digitalmainelibrary.org/all-databases/
National Security Agency. http://www.nsa.gov
The Atomic Archive. http://www.atomicarchive.com
International Spy Museum. http://spymuseum.org
John F. Kennedy Library and Museum. http://www.cs.umb.edu/jfklibrary/index.htm
The Manhattan Project Heritage Preservation Association, Inc. https://ahf.nuclearmuseum.org/ahf/history/manhattan-project/
"Secrets, Lies, and Atomic Spies." Nova Online. http://www.pbs.org/wgbh/nova/venona
U.S. Central Intelligence Agency (CIA). http://www.cia.gov
