Which innovative packaging design change was first introduced for mass-market Bibles in the 1950s, significantly impacting how people engaged with religious texts?

Religious and philosophical texts have evolved not just in content but in their physical presentation over centuries. The packaging of sacred texts has often reflected their cultural significance, technological capabilities of the era, and philosophical approaches to knowledge preservation. This trivia question explores how one major religious text's packaging has transformed to meet modern consumer needs while respecting tradition.

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Leather-bound pocket editions with gilt edges
Text divided into verses with numerical references for easy citation
Color-coded sections with topical reference guides
Waterproof covers for missionary work in tropical regions