Another spy, Lord Baden Powell, hid maps of enemy installations in a drawing book while pretending to be a naturalist (which he was). https://www.atlasobscura.

Another spy, Lord Baden Powell, hid maps of enemy installations in a drawing book while pretending to be a naturalist (which he was). https://www.atlasobscura.com/articles/the-founder-of-the-boy-scouts-hid-maps-in-insect-drawings https://www.atlasobscura.com/articles/the-founder-of-the-boy...