Which children's book character was transformed into an advertising icon in the 1960s, appearing in a nationwide campaign with the slogan 'Read to me'?

The publishing industry has created some of the most memorable advertising campaigns to promote books and reading. From catchy slogans to iconic characters, publishers have found creative ways to market literature to the masses. This trivia question tests your knowledge about a famous advertising campaign that transformed a classic literary character into a promotional icon.

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The Cat in the Hat (Dr. Seuss)
Curious George (H.A. Rey)
Paddington Bear (Michael Bond)
Madeline (Ludwig Bemelmans)