Lesemuseum <Kassel>
| Louis Spohr an William Sterndale Bennett in Kassel | Kassel, Freitag 7. Januar 1842 | 1842010714 |
| Louis Spohr an Wilhelm Spohr in Braunschweig | Kassel, Dienstag 12. September 1848 | 1848091200 |
| Louis Spohr an William Sterndale Bennett in Kassel | Kassel, Freitag 7. Januar 1842 | 1842010714 |
| Louis Spohr an Wilhelm Spohr in Braunschweig | Kassel, Dienstag 12. September 1848 | 1848091200 |