Looks at several incidents where codebreakers were able to read top secret messages. Includes segments on the purple analog machine which enabled U.S. codebreakers to read Japanese messages for months before and after Pearl Harbor, the importance of codebreakers in the victory of the Battle of Midwa...
|Corporate Author:||InCA Ltd., NDR International., WGBH (Television station : Boston, Mass.), WGBH Educational Foundation.|
|Other Authors:||Woolard, William., Johnson, Brian.|
[Boston, Mass.] :
WGBH Educational Foundation,
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