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Library of Congress, largest and most comprehensive library in the world, located in Washington, D.C. The Library of Congress functions as the national library of the United States, although it has never been officially recognized as such through legislation. The library’s primary purpose is to serve as the research library of the Congress of the United States, but its collections, services, and reading rooms are freely available for use by all persons over high school age. The Library of Congress also serves as the official copyright agency of the United States.