Which innovative packaging format, introduced in the 1930s, revolutionized the book industry by making literature more affordable and accessible to the masses?

The art of book packaging has evolved dramatically over the centuries, influencing reader perception and sales. From ancient scrolls to modern dust jackets, the way literature is presented physically has been a crucial marketing strategy in the publishing industry. This trivia question explores a significant innovation in book packaging that revolutionized the industry and reader accessibility.

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Paperback books (pocket books)
Leather-bound collector's editions
Illuminated manuscripts
Audiobook vinyl records