Which packaging innovation in the 1960s revolutionized how religious texts were distributed and made them more accessible to the general public?

Throughout history, religious texts have been packaged and presented in various ways to enhance their significance and accessibility. From ancient scrolls to modern digital formats, the packaging of sacred texts reflects both technological advancements and philosophical approaches to spiritual knowledge. This trivia question explores an innovative packaging change that significantly impacted how people engage with religious texts in the modern era.

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Pocket-sized leather-bound editions with gold-leaf pages
Mass-market paperback Bibles with contemporary cover designs
Illuminated manuscript reproductions with protective cases
Multi-volume encyclopedia-style religious commentaries