"When America entered World War II in 1941, [it] faced an enemy that had banned and burned over 100 million books and caused fearful citizens to hide or destroy many more. Outraged librarians launched a campaign to send free books to American troops and gathered 20 million hardcover donations. In 1943, the War Department and the publishing industry stepped in with an extraordinary program: 120 million small, lightweight paperbacks, for troops to carry...