WIA FC/1912/4/52 | Warburg, Aby to Warburg, Mary 10/10/1912 | apologizes for the official stationery, but send her personal birthday greetings; it is a pity... |
WIA GC/1912/389 | Warburg, Aby to Haseloff-Preyer, Adelheid 16/04/1912 | he has heard that Mr. Haseloff is feeling better again; he wishes him well and will write to him... |