Which product design innovation for the Bible, first implemented in the 13th century, revolutionized how people could navigate and reference religious texts?

Religious texts are some of the oldest and most influential products in human history. Their presentation, design, and packaging have evolved dramatically over centuries - from hand-copied scrolls to mass-market paperbacks and now digital formats. This poll explores a fascinating product innovation in religious text publishing that revolutionized accessibility and democratized spiritual knowledge.

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Chapter and verse numbering system
Red letter editions (printing Jesus's words in red)
Concordance appendices
Thumb indexes on page edges