Which packaging innovation in the publishing industry is credited with making literature more accessible to soldiers during World War II and subsequently revolutionizing the mass-market paperback industry?

Book packaging has evolved dramatically over the centuries, influencing reader appeal and marketability. Publishers continuously innovate in cover design, materials, and presentation to attract different demographic segments. This poll explores a significant packaging innovation that transformed the accessibility of literature for a specific market segment. Test your knowledge about how product packaging revolutionized reading habits!

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Armed Services Editions (ASEs) - compact, lightweight paperbacks designed to fit in military uniform pockets
Penguin's tri-color coded covers system that categorized books by genre for quick selection
Waterproof dust jackets with embedded illumination for nighttime reading in battlefield conditions
Double-spine binding that allowed books to be shared by two readers simultaneously during rationing