Which innovative branding strategy, introduced in 1935, revolutionized the book industry by creating instant visual recognition for readers and is now considered one of the most successful publishing brand identities ever?

The publishing industry has seen remarkable transformations in how literary works are branded and marketed to readers. Major publishing houses have developed sophisticated branding strategies that have revolutionized how books reach their audiences. This trivia question explores a significant innovation in literary brand recognition that changed how readers discover and engage with books.

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Penguin Books' standardized color-coded covers and logo
Random House's 'Modern Library' leather-bound collector editions
Harper & Row's 'First Edition Club' subscription service
Simon & Schuster's 'Pocket Books' portable paperback format