World War II POWs Used Escape Maps Hidden In Monopoly Pieces

Last year, an archive of World War II maps was donated to the British Library Map Library. Some of these maps are now on display to the public, and they have f...  ...ual venture during the Second World War: printing maps on *strong cla...

http://www.neatorama.com/2009/03/18/world-war-ii-pows-used-escape-maps-secreted-in-monopoly-pieces/