Ferdinand David an Louis Spohr in Kassel | Leipzig, Donnerstag 14. September 1837 | 1837091440 |
Louis Spohr an Ferdinand David in Leipzig | Kassel, Sonntag 24. September 1837 | 1837092410 |
Christian Friedrich Lueder an Louis Spohr in Kassel | Katlenburg, Montag 20. Januar 1845 | 1845012035 |