WIA GC/1909/464
Warburg, Aby to Rathgen, Karl 18/01/1909
he arranged a meeting with Max Warburg and Professor [Robert] Münzel and asks him to join them...
WIA GC/1915/651
Warburg, Aby to Rathgen 19/06/1915
Warburg's sister-in-law told Warburg that Mrs. [Emilie] Rathgen did not trust Mrs. [Nancy Keutgen...
WIA GC/1916/787
Ziebarth, Erich to Warburg, Aby 08/07/1916
has met Warburg's daughter Marietta; is looking forward to seeing Warburg at the meeting of the...