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Its collections include more than 30 million catalogued books and other print materials in 470 languages; more than 58 million manuscripts; the largest rare book collection in North America, including a Gutenberg Bible (one of only three perfect vellum copies known to exist); over 1 million US Government publications; 1 million issues of world newspapers spanning the past three centuries; 33,000 bound newspaper volumes; 500,000 microfilm reels; over 6,000 comic book titles; the world's largest collection of legal materials; films; 4.8 million maps; sheet music; and 2.7 million sound recordings. The head of the Library is the Librarian of Congress.