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# Monday, July 11, 2011
How to Be a Spy, 1918-Style
Posted by Diane

The CIA has recently declassified WWI-era documents bearing formulas for invisible ink, instructions for exposing concealed writing in German correspondence, and ways to open sealed envelopes undetected.

The typed memos were believed to be the country’s oldest still-classified documents. You can see them on display this month at the National Archives in Washington, DC and on the CIA’s website (scroll down a little).

Read more about the documents in this CNN article.

NARA | Social History
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