WIA GC/10099 | Rosenbacher, Richard to Warburg, Aby 18/11/1896 | thanks him for letters of introduction to Warburg's friends in California; greetings |
WIA GC/10100 | Rosenbacher, Richard to Warburg, Aby 07/12/1896 | on his travels in California; hopes that Warburg is satisfied with Berlin |
WIA GC/17361 | Cohen, Arthur to Warburg, Aby 11/06/1926 | sends birthday greetings; life after 60 is not so bad; he together with his brother-in-law... |
WIA GC/19216 | Rosenbacher, Richard to Warburg, Aby 30/10/1927 | recommendation for Dr. Edwin Landau, of Koblenz, son of a friend of Charlotte's; Landau works in... |
WIA GC/19217 | Rosenbacher, Richard to Warburg, Aby 29/11/1927 | re receiving Edwin Landau; Rosenbacher has heard that Warburg was not in Hamburg when Landau... |