codebreakers 
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SOURCE: History.com
11/6/19
How Codebreakers Helped Secure U.S. Victory in the Battle of Midway
Advance intelligence helped the Allies turn the tables on Japan in this crucial World War II naval battle.
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SOURCE: New Historian
2-11-15
Top Secret Documents Found in Roof at Bletchley Park
Along with the fragmentary codebreaking documents found in the roof were parts of an atlas, a pinboard and a fashion article from a magazine.