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American Memory, the Library of Congress.
A number of Mozart autographs exist in the Moldenhauer Archives, which is one of the many collections in American Memory.
Music Treasures Consortium offers digitized music manuscripts of composers held in US and European libraries, including:
British Library Harvard University. Eda Kuhn Loeb Music Library Library of Congress Juilliard School. Lila Acheson Wallace Library Morgan Library & Museum New York Public Library
Music manuscripts, sketches and printed music by Beethoven and other composers including Mozart.