Which innovative book packaging format, introduced in the 1930s, revolutionized the publishing industry by making literature more affordable and accessible to the masses?

The publishing industry has seen numerous innovations in book packaging and presentation over the decades. From dust jackets to interactive elements, the physical presentation of literature has evolved dramatically to attract readers and enhance the reading experience. This trivia question focuses on a groundbreaking packaging innovation that transformed how certain books were marketed and consumed.

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Paperback books (pocket books)
Leather-bound collector's editions
Illustrated dust jackets
Folio society boxed sets