Rothschild, James von
| Louis Spohr an Wilhelm Speyer in Frankfurt am Main | Kassel, Freitag 20. Juni 1834 | 1834062002 |
| Wilhelm Speyer an Louis Spohr in Kassel | Frankfurt am Main, Dienstag 1. Juli 1834 | 1834070132 |
| Wilhelm Happ an Louis Spohr in Kassel | Paris, Montag 4. Juli 1842 | 1842070440 |
| Joseph Robinson an Louis Spohr in Kassel | Dublin, Donnerstag 10. April 1856 | 1856041047 |