Louis Spohr an Ferdinand David in Leipzig | Kassel, Montag 26. September 1842 | 1842092610 |
Carl Müller an Louis Spohr in Kassel | Düsseldorf, Montag 7. November 1842 | 1842110745 |
Carl Müller an Louis Spohr in Kassel | Münster, Freitag 31. Dezember 1847 | 1847123145 |