Rubinstein, Anton : Okean
| Moritz Hauptmann an Louis Spohr in Kassel | Leipzig, Donnerstag 18. Januar 1855 | 1855011833 |
| Louis Spohr an Moritz Hauptmann in Leipzig | Kassel, Dienstag 17. November 1857 | 1857111703 |
| Moritz Hauptmann an Louis Spohr in Kassel | Leipzig, Montag 23. November 1857 | 1857112333 |
| Aloys Schmitt an Louis Spohr in Kassel | Frankfurt am Main, Sonntag 1. August 1858 | 1858080145 |