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WWII Maps Hidden Inside Playing Cards
by Elonka at 12:56 pm EDT, Apr 25, 2003

] During World War II, United States Playing Card provided
] war-related playing cards that were mailed to U.S.
] soldiers in German prison camps.
]
] The cards were specially designed to conceal maps
] detailing escape routes. The maps were revealed when the
] cards were moistened.

Now that's a type of steganography that I hadn't heard of yet. :)