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Secrets of the Spies

This interactive feature about spies and espionage contains a timeline about secret codes, profiles of famous double agents, a brief glossary, and a short list of films featuring codes and spies. Also contains links to related features on the Federal Bureau of Investigation (FBI) and on polygraphs. From CBS News.
[A broken link]
http://www.cbsnews.com/htdocs/spies/framesource.html