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Iwanami Shoten was founded in 1913 by Shigeo Iwanami. Its first major publication was the Natsume Sōseki novel "Kokoro" in 1914. It is known for scholarly publications, editions of classical Japanese literature, dictionaries, and high-quality paperbacks. Since 1955, it has published Kōjien, a single-volume Japanese dictionary widely considered authoritative.