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Harry Potter and the Deathly Hallows, the final book in the popular Harry Potter series by J. K. Rowling, was released and sold 15 million copies in its first 24 hours, making it the fastest-selling book in history.

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Harry Potter and the Deathly Hallows
2007 fantasy novel by J. K. Rowling
Harry Potter and the Deathly Hallows is a fantasy novel written by British author J. K. Rowling. It is the seventh and final novel in the Harry Potter series. It was released on 21 July 2007 in the United Kingdom by Bloomsbury Publishing, in the United States by Scholastic, and…Source: Wikipedia (CC BY-SA)
Harry Potter
Series of fantasy novels by J. K. Rowling
Harry Potter is a series of seven fantasy novels written by British author J. K. Rowling. The novels chronicle the lives of a young wizard, Harry Potter, and his friends, Ron Weasley and Hermione Granger, all of whom are students at Hogwarts School of Witchcraft and Wizardry.…Source: Wikipedia (CC BY-SA)
J. K. Rowling
British author and philanthropist (born 1965)
Joanne Rowling, known by her pen name J. K. Rowling, is a British author and philanthropist. She is the author of Harry Potter, a seven-volume fantasy novel series published from 1997 to 2007. The series has sold over 600 million copies, has been translated into 84 languages,…Source: Wikipedia (CC BY-SA)