Biehl, Eduard
| Julius Schuberth an Louis Spohr in Kassel | Hamburg, Sonntag 23. April 1843 | 1843042355 |
| Julius Schuberth an Louis Spohr in Kassel | Cannstatt, Montag 7. August 1843 | 1843080755 |
| Julius Schuberth an Louis Spohr in Kassel | Hamburg, Montag 16. Oktober 1843 | 1843101655 |