Which paperback book packaging innovation, introduced in 1935, revolutionized the publishing industry by making books more affordable and accessible to the mass market?

The way books are packaged and presented has evolved dramatically over centuries, influencing how we interact with literature. From ancient scrolls to modern e-readers, packaging innovations have shaped reading experiences and accessibility. This poll tests your knowledge about a revolutionary packaging format that transformed the literary marketplace and reading habits worldwide.

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Penguin Books' standardized color-coded covers and uniform size
Random House's leather-bound pocket editions
Harper Collins' illustrated dust jackets
Simon & Schuster's spiral-bound format