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The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office. The Library of Congress Homepage Featured Items Pause Previous Congress.gov Track bills on the official site for U.S. federal legislative information. Online Reference Service Available Ask a Librarian when you need research help — trained experts standing by. 1/5 Library of Congress Fall Concert Season This Fall, mark a century of Concerts from the Library of Congress with 15 unforgettable performances. 1/5 Library of Congress Acquires “Wizard of Oz” Musical Sketches To Add to the Harold Arlen Collection Collection Includes Handwritten Music and Lyric Sketches Showing Creative Process Behind Iconic Film, Along with Letters and Artwork 1/5 Thursday Night Fun & Programs Live! at the Library features evening engagement in a gorgeous setting. 1/5 Congress.gov Track bills on the official site for U.S. federal legislative information. 1/5 Online Reference Service Available Ask a Librarian when you need research help — trained experts standing by. Library of Congress Fall Concert Season This