Which innovation in the 1930s revolutionized book cover design and retail display, introducing the concept of the 'dust jacket' as both protective covering and marketing tool?

Throughout literary history, cover design has been crucial for attracting readers and conveying a book's essence. From minimalist classics to elaborate modern designs, book covers represent both artistic expression and marketing strategy. This poll tests your knowledge about a revolutionary shift in book cover design that changed the publishing industry's approach to visual merchandising.

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Allen Lane's Penguin Books color-coding system
Random House's embossed leather binding technique
Houghton Mifflin's transparent cellophane wrapping
Harper's photographic illustration process