What significant innovation did Penguin Books introduce in 1935 that revolutionized the publishing industry's marketing approach?

Penguin Books revolutionized publishing with its distinctive logo and affordable paperbacks. The company's innovative approach to branding and marketing transformed how we access literature, making quality books accessible to the masses rather than just the elite. Test your knowledge about this iconic literary brand that changed the publishing industry forever!

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Color-coded book covers based on genre (orange for fiction, green for crime, etc.)
First publisher to include author photos on all book covers
Introduction of the hardcover book with dust jacket
First to sell books through newspaper stands instead of bookstores