Today we’re talking about Armed Service Editions: paperback books designed to be sent overseas to American troops during World War II. Edited and printed by the non-profit Council on Books in Wartime, they were small, portable volumes with oblong silhouettes that could easily fit into a uniform pocket. Complete and surprisingly uncensored novels by authors like Jack London, Ernest Hemingway, and F. Scott Fitzgerald were a hit with the armed services—so much so that it’s hard for collectors to find copies in good condition today. In addition to improving morale, Armed Service Editions helped lay the groundwork for the paperback publishing boom of the 1950s, which brought inexpensive, conveniently-sized literature to a broad audience, transforming reading habits around the world.