Neukomm, Sigismund
| Elisabeth Filipowicz an Louis Spohr in Kassel | London, Montag 24. September 1838 | 1838092440 |
| Edward Taylor an Louis Spohr in Kassel | London, Freitag 24. Juli 1840 | 1840072434 |
| Carl Meyer an Louis Spohr in Kassel | Luzern, Sonnabend 26. Juni 1841 | 1841062646 |
| Louis Spohr an Adolph Hesse in Breslau | Kassel, Freitag 6. August 1841 | 1841080601 |