Which publishing innovation, first implemented by Penguin Books in 1935, revolutionized book marketing by using standardized cover designs and color-coding for different genres?

The publishing industry has seen numerous creative marketing approaches to promote books and authors. From innovative packaging to celebrity endorsements, publishers have constantly evolved their strategies to capture readers' attention in an increasingly competitive market. Test your knowledge about one of the most successful marketing innovations in modern literary history!

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Paperback books with uniform cover designs
Hardcover books with dust jackets featuring author photographs
Limited edition boxed sets with original artwork
Books with attached music records for promotional purposes