Which 1930s publishing innovation revolutionized book marketing by creating a standardized visual brand identity that remains influential today?

The publishing industry has seen dramatic shifts in how books are marketed and branded over the decades. One particular innovation fundamentally changed how readers discover and select books, creating an instantly recognizable visual language for genres and transforming publishing marketing strategies. Test your knowledge about this significant evolution in literary product marketing!

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Penguin Books' color-coded paperback covers
Random House's illustrated dust jackets
Harper Collins' author photograph requirement
Simon & Schuster's embossed hardcover logos