Crescentini, Girolamo
| Wilhelm Speyer an Louis Spohr in Kassel | Offenbach, Donnerstag 17. September 1829 | 1829091732 |
| Louis Spohr an Karl Feige in Kassel | Kassel, Donnerstag 26. November 1829 | 1829112613 |
| Wilhelm Speyer an Louis Spohr in Kassel | Offenbach, Donnerstag 17. September 1829 | 1829091732 |
| Louis Spohr an Karl Feige in Kassel | Kassel, Donnerstag 26. November 1829 | 1829112613 |