Which innovative book packaging technique, introduced in the 1930s, revolutionized the publishing industry by making high-quality literature more affordable and portable?

In the publishing world, how books are packaged and presented has evolved dramatically over centuries. From ornate leather-bound volumes to modern dust jackets with strategic design elements, book packaging plays a crucial role in attracting readers and protecting literary works. This trivia question explores an innovative packaging technique that revolutionized how certain books were marketed and preserved in the mid-20th century, making literature more accessible while maintaining collectible value.

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The mass market paperback with glued bindings
Leather-bound limited editions with gold leaf edges
Hardcover books with removable dust jackets
Spiral-bound artist editions with transparent covers