Balfe, Michael
| Edward Taylor an Louis Spohr in Kassel | London, Freitag 31. Mai 1839 | 1839053134 |
| Louis Spohr an Adolph Hesse in Breslau | Kassel, Mittwoch 16. Oktober 1839 | 1839101601 |
| Edward Taylor an Louis Spohr in Kassel | London, Freitag 24. Juni 1842 | 1842062434 |
| Edward Taylor an Louis Spohr in Kassel | London, Dienstag 20. September 1842 | 1842092034 |