Romberg, Andreas : Sonaten, Vl Kl, op. 9
| Louis Spohr an Ambrosius Kühnel in Leipzig | Gotha, Freitag 21. November 1806 | 1806112120 |
| Thomas Barker an Louis Spohr in Kassel | Thirkleby Thirsk, Dienstag 15. Dezember 1835 | 1835111514 |
| Louis Spohr an Ambrosius Kühnel in Leipzig | Gotha, Freitag 21. November 1806 | 1806112120 |
| Thomas Barker an Louis Spohr in Kassel | Thirkleby Thirsk, Dienstag 15. Dezember 1835 | 1835111514 |