Spohr, Louis : Quartette, Vl 1 2 Va Vc, WoO 42
| Louis Spohr an Thomas Täglichsbeck in Löwenberg | Kassel, Dienstag 4. August 1857 | 1857080413 |
| Louis Spohr an Moritz Hauptmann in Leipzig | Kassel, Dienstag 17. November 1857 | 1857111703 |
| Louis Spohr an Thomas Täglichsbeck in Löwenberg | Kassel, Dienstag 4. August 1857 | 1857080413 |
| Louis Spohr an Moritz Hauptmann in Leipzig | Kassel, Dienstag 17. November 1857 | 1857111703 |