Which packaging innovation, introduced in the 1930s, revolutionized the book industry by making literature more accessible to the masses through affordable, portable formats?

The publishing industry has evolved dramatically over the decades, with innovative packaging strategies helping to transform how readers discover and engage with books. From special collector's editions to unique marketing approaches, packaging innovations have played a crucial role in the commercial success of many literary works. Test your knowledge about a revolutionary packaging concept that changed the book retail landscape forever!

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Penguin Books' color-coded paperbacks with uniform design
Folio Society's handcrafted limited edition hardcovers
Easton Press's leather-bound collector editions
Random House's dust jacket illustration standardization