Which groundbreaking book packaging innovation was first commercially successful in the 1930s, making literature more accessible during the Great Depression?

The publishing industry has constantly evolved how books are packaged and presented to readers. From dust jackets to special editions, publishers have found creative ways to make their products stand out. This trivia question explores an innovative packaging technique that revolutionized access to literature for a specific audience. Test your knowledge about the intersection of product packaging and literary history!

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Paperback books (mass market pocket editions)
Dust jackets with embossed lettering
Leather-bound subscription series
Illustrated cloth binding with gilt edges