J. van Beethoven (1801 Vienne.) - NYPL Digital Collections
Beethoven digital
Genre: Scores. - Digital Scores and Libretti - CURIOSity Digital
William Kinderman - The String Quartets of Beethoven-University of
PDF) Beethoven's Tempo Indications
J. van Beethoven (1801 Vienne.) - NYPL Digital Collections
Music Library Blog
Karl van Beethoven, 1801-1858. L. v. B.'s Nephew - NYPL Digital
Beethoven, Ludwig van, Christian Thielemann, Myung-Whun Chung
Louis van Beethoven - NYPL Digital Collections