Auber, Daniel-François-Esprit : La sirène
| Max Schloß an Louis Spohr in Kassel | Kassel, Donnerstag 29. August 1850 | 1850082945 |
| Matthäus Flach an Louis Spohr in Kassel | Kassel, Donnerstag 29. August 1850 | 1850082946 |
| Max Schloß an Louis Spohr in Kassel | Kassel, Donnerstag 29. August 1850 | 1850082945 |
| Matthäus Flach an Louis Spohr in Kassel | Kassel, Donnerstag 29. August 1850 | 1850082946 |