Which innovative book packaging format, introduced in the 1930s, dramatically increased literature accessibility and is credited with democratizing reading during the Great Depression?

In the publishing world, book cover design has evolved dramatically as both an art form and a marketing tool. From simple cloth bindings to today's interactive covers with augmented reality features, packaging innovations have transformed how readers connect with literature. This trivia question explores a significant milestone in book packaging that revolutionized the industry and readers' relationship with books.

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Paperback books with illustrated covers (Penguin Books)
Dust jackets with promotional blurbs
Leather-bound subscription editions
Embossed hardcover limited editions