Biller, Carl August Friedrich
| Louis Spohr an August Eduard Grell in Berlin | Kassel, Freitag 13. Februar 1852 | 1852021315 |
| Adolph Hesse an Louis Spohr in Kassel | Breslau, Donnerstag 19. April 1838 | 1838041931 |
| Louis Spohr an August Eduard Grell in Berlin | Kassel, Freitag 13. Februar 1852 | 1852021315 |
| Adolph Hesse an Louis Spohr in Kassel | Breslau, Donnerstag 19. April 1838 | 1838041931 |