WIA GC/1915/15 | Warburg, Aby to Baumbach, Freiin von 04/10/1915 | refers to his cousin, the banker Abraham S. Warburg; Abraham S. Warburg has written to Mrs. von... |
WIA GC/1915/802 | Warburg, Aby to Warburg, Aby S. 23/09/1915 | tells him of a phonecall by Freiin von Baumbach who thought she was speaking with Aby S. Warburg... |