Which publishing innovation by the Gideons International organization revolutionized Bible distribution in the 20th century?

Religious texts have been among the most influential products in human history, with fascinating publishing stories behind them. This trivia question explores the commercial history of one of the world's most widely distributed religious texts and the innovative publishing techniques that helped spread its message. Test your knowledge about how spiritual products reached their audiences throughout history!

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Placing free Bibles in hotel rooms across the world
Creating the first illustrated children's Bible with color pictures
Developing the first pocket-sized Bible with ultra-thin pages
Publishing the first Bible available in over 50 languages in a single volume