Which innovative book packaging format, introduced in the 1930s, made literature more affordable and accessible to the masses through a revolutionary distribution model?

Book packaging has evolved significantly over centuries, influencing both preservation and marketing of literature. From ancient scrolls to modern e-readers, the 'packaging' of written works shapes our interaction with literary content. This poll tests your knowledge about a revolutionary packaging innovation that transformed the accessibility and popularity of books in the 20th century.

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Penguin Paperbacks, with their standardized size, distinct color-coding by genre, and affordable price point
Folio Society limited editions, with their handcrafted bindings and exclusive illustrations
Book-of-the-Month Club hardcovers, with their subscription-based delivery model
Pulp fiction magazines, with their serialized stories and illustrated covers