Which revolutionary book packaging format, introduced in 1935 by Penguin Books, made quality literature more accessible through standardized design and affordable pricing?

The publishing industry has seen remarkable innovations in book packaging and presentation throughout history. From dust jackets to creative box sets, the way literature is packaged significantly impacts consumer perception and sales. This trivia question focuses on a groundbreaking packaging innovation that revolutionized access to literature for millions of readers worldwide.

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• The mass market paperback with color-coded covers and uniform design
• The leatherbound collector's edition with gold-leaf page edges
• The spiral-bound artistic edition with transparent protective covers
• The hardcover book club edition with detachable bookplates

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