Ries, Joseph
| Ferdinand Ries an Louis Spohr in Gandersheim | London, Sonntag 10. und Dienstag 12. September 1820 | 1820091043 |
| Ferdinand Ries an Louis Spohr in Kassel | London, Dienstag 30. April 1822 | 1822043043 |
| Ferdinand Ries an Louis Spohr in Kassel | Godesberg, Dienstag 25. November 1825 | 1825112543 |