Which book cover design innovation from the 1930s revolutionized the publishing industry by making books more durable while allowing for more vibrant, eye-catching graphics?

Book cover design has transformed dramatically over the centuries, evolving from simple protective bindings to sophisticated marketing tools. Today's covers blend artistic expression with strategic product design elements to attract readers and communicate the essence of the content within. This trivia question explores a significant innovation in publishing history that changed how we interact with literary products.

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Dust jackets with cellophane coating
Lithographed cloth covers
Perfect binding with illustrated paperbacks
Embossed leather with gold leaf accents