Höxter
| Louis Spohr an Heinrich Herdtmann in Höxter | Kassel, Sonnabend 7. November 1840 | 1840110710 |
| Heinrich Herdtmann an Louis Spohr in Kassel | Höxter, Freitag 19. November 1841 | 1841111940 |
| Heinrich Herdtmann an Louis Spohr in Kassel | Höxter, Freitag 19. November 1841 | 1841111940 |
| Louis Spohr an Heinrich Herdtmann in Höxter | Kassel, Sonnabend 7. November 1840 | 1840110710 |