Which famous literary marketing campaign featured the tagline "Don't Panic" and created a mock travel guide as promotional material?

The publishing industry has created some of the most innovative and successful marketing campaigns in retail history. From loyalty programs that reward avid readers to taglines that became cultural touchstones, publishers have found creative ways to connect books with readers. Test your knowledge about the business side of literature and how great works made their way into the hands of millions.

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The Hitchhiker's Guide to the Galaxy (1979)
1984 (Orwell's dystopian classic)
The Da Vinci Code (with cryptex puzzles)
Harry Potter (with Scholastic's midnight release parties)