Which advertising slogan was created by Penguin Books in the 1930s to revolutionize the paperback market?

Many famous publishing houses have created memorable advertising slogans to market their books and authors. These taglines have become part of literary culture, helping to establish brand identity in the competitive world of publishing. Test your knowledge about the intersection of literature and marketing by identifying which famous slogan belongs to which publisher.

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Good books are cheap books
Books for every kind of reader
Open a book, open your mind
Reading is to the mind what exercise is to the body