Godesberg
| Louis Spohr an Carl Friedrich Peters in Leipzig | Kassel, Sonntag 3. Juli 1825 | 1825070320 |
| Louis Spohr an Hubert Ries in Berlin | Kassel, Montag 4. Juli 1825 | 1825070410 |
| Ferdinand Ries an Louis Spohr in Kassel | Godesberg, Dienstag 25. November 1825 | 1825112543 |
| Ferdinand Ries an Louis Spohr in Kassel | Godesberg, Dienstag 25. November 1825 | 1825112543 |