Raff, Joseph Joachim : König Alfred
| Joseph Joachim Raff an Louis Spohr in Kassel | Weimar, Sonntag 18. April 1852 | 1852041843 |
| Louis Spohr an Joseph Joachim Raff in Weimar | Kassel, Sonntag 25. April 1852 | 1852042513 |
| Joseph Joachim Raff an Louis Spohr in Kassel | Weimar, Sonntag 18. April 1852 | 1852041843 |
| Louis Spohr an Joseph Joachim Raff in Weimar | Kassel, Sonntag 25. April 1852 | 1852042513 |