Ferdinand Ries an Louis Spohr in Kassel | Frankfurt am Main, Dienstag 24. Februar 1835 | 1835022443 |
Louis Spohr an Anton Forsboom in Frankfurt am Main | Kassel, Freitag 27. Februar 1835 | 1835022715 |
Aloys Schmitt an Louis Spohr in Kassel | Frankfurt am Main, Dienstag 27. April 1858 | 1858042745 |
Aloys Schmitt an Louis Spohr in Kassel | Frankfurt am Main, Sonntag 1. August 1858 | 1858080145 |