Which packaging innovation in the 1960s-70s dramatically increased the accessibility and distribution of religious texts worldwide?

In the world of religious texts and philosophical works, packaging has evolved significantly over centuries. From ancient scrolls to modern digital formats, how these sacred and profound texts are packaged affects accessibility, preservation, and user experience. This poll tests your knowledge about a groundbreaking packaging innovation that transformed how religious texts reached global audiences in the 20th century.

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The development of microprinted Bibles that could fit in a pocket (microform technology)
The introduction of lightweight, low-cost paperback editions of religious texts by publishers like Penguin and Oxford World's Classics
The invention of specialized leather-bound 'missionary editions' with weather-resistant covers
The creation of multi-language parallel text editions with synchronized verse numbering