1. MUS RP 23 Reference (shelfmark): MUS RP 23 Title: Scope & Content: Photographs of an undated letter from Ludwig van Beethoven to Antonio Diabelli. Collection Area: Music Collections Languages: German Date Range: 29 Jun 1966 Extent: 3 photos
2. MUS RP 573 Reference (shelfmark): MUS RP 573 Title: Scope & Content: Photocopy of an undated letter from Ludwig van Beethoven to Johann Nepomuk Kanka. Collection Area: Music Collections Languages: Undetermined Date Range: 22 Mar 1971 Extent: 2 photocopies
3. MUS RP 1076 Reference (shelfmark): MUS RP 1076 Title: Scope & Content: Photocopy of a letter from Ludwig van Beethoven to Willibrord Joseph Mähler, undated [Vienna, 1819]. Collection Area: Music Collections Languages: German Date Range: 23 Apr 1975 Extent: 2 photocopies