Which innovative packaging/distribution technique first helped the Bible become a truly mass-market product in the early 20th century?

Throughout history, the way religious texts are produced, packaged, and distributed has evolved dramatically, reflecting both technological advancement and changing consumer preferences. From ancient scrolls to modern apps, religious literature has adapted to meet believers where they are. This trivia question explores an interesting milestone in the marketing and distribution of one of history's most influential books.

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The 'Pocket Bible' format with ultra-thin pages and compact size
The Gideons' strategy of free Bible placement in hotel rooms
The 'Red Letter Edition' highlighting Jesus's words in red ink
The illustrated Family Bible with genealogy record pages