Ludwig van Beethoven, Skizzenbuch ,Ludwig van Beethoven autograph letter to Count Franz von Brunswick, | Library of Congress,Ludwig van Beethoven (1770-1827), A lock of hair, taken on the composer's deathbed in 1827, with an autograph letter of presentation by Marie Pachler | Christie's,Ludwig van Beethoven (1770-1827), Contemporary scribal manuscript, the printer's copy for the String Quartet in E flat, Op.127, n.p. [Mainz], n.d. [1826] | Christie's,Beethoven's Secret Code - The Atlantic,