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Intelligence Events Timeline

April 19, 2011

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CIA released the US Government's six oldest classified documents, dating from 1917 and 1918. The documents describe secret-writing formulas, letter-opening techniques, and methods of covert communications. They are housed at the National Archives and are believed to be the only remaining classified documents from the World War I era. Pictured here, an advanced flaps and seals kit.

No. 107 of 120
Tools assorted in a tool holder into various pockets.

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Tools assorted in a tool holder into various pockets.