Frege, Livia
| Livia Frege an Louis Spohr in Kassel | Leipzig, Montag 3. März 1856 | 1856030345 |
| Moritz Hauptmann an Louis Spohr in Kassel | Leipzig, Freitag 5. November 1847 | 1847110533 |
| Christian Gottlob Frege an Louis Spohr in Kassel | Wiesbaden, Montag 3. April 1854 | 1854040345 |
| Carl Georg Firnhaber an Louis Spohr in Kassel | Wiesbaden, Dienstag 4. April 1854 | 1854040449 |
| Louis Spohr an Moritz Hauptmann in Leipzig | Kassel, Freitag 22. Februar 1856 | 1856022203 |
| Moritz Hauptmann an Louis Spohr in Kassel | Leipzig, Mittwoch 3. November 1858 | 1858110333 |