In 1943, in the middle of the Second World War, America's book publishers took an audacious gamble. They decided to sell the armed forces cheap paperbacks, shipped to units scattered around the globe. Instead of printing only the books soldiers and sailors actually wanted to read, though, publishers decided to send them the best they had to offer. Over the next four years, publishers gave away 122,951,031 copies of their most valuable titles.
Read the full story from The Atlantic:
http://www.theatlantic.com/business/archive/2014/09/publishers-gave-away-122951031-books-during-world-war-ii/379893/