| Letter | Description | Signature | Date |
|---|---|---|---|
|
Eugenio Tornaghi
>
Ricordi
No place |
CLET002314 | No date | |
|
Achille De Lauzières
>
Ricordi
No place |
LLET009529 | No date |
|
Achille De Lauzières
>
Ricordi
No place |
LLET009554 | No date |