Ernst, Auguste
| Wilhelm Speyer an Louis Spohr in Kassel | Frankfurt am Main, Montag 25. April 1842 | 1842042532 |
| Louis Spohr an Wilhelm Speyer in Frankfurt am Main | Kassel, Dienstag 3. Mai 1842 | 1842050302 |
| Wilhelm Speyer an Louis Spohr in Kassel | Frankfurt am Main, Montag 25. April 1842 | 1842042532 |
| Louis Spohr an Wilhelm Speyer in Frankfurt am Main | Kassel, Dienstag 3. Mai 1842 | 1842050302 |