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Allen was a writer of fiction, non-fiction, and children's books. His most famous work is the novel "The Catcher in the Rye" which was published in 1951. It is a coming-of-age story about a young boy named Holden Caulfield who is struggling to find his place in the world. Allen's other works include the short story collection "Nine Stories", the novel "A Moveable Feast", and the play "The Glass Menagerie".