Espionage; Shipping; War posters, American--Cartoons and comics; World War, 1939-1945--Naval operations, German--Submarines; World War, 1939-1945--Posters--United States--Cartoons and comics;
Color poster from a cartoon story by Eric Ericson (1914-1959) entitled "the sound that kills." The cartoon story depicts how the sound of innocent words can travel from a local diner or bus, streetcar, or train to a enemy submarine and bring about...