WIA GC/10921
Warburg, Aby to Heise, Helene 10/09/1908
on a conversation he had with [Erich] Ziebarth; the best place for her son [Carl Georg Heise...
WIA GC/3022
Heise, Helene to Warburg, Aby 13/09/1908
thanks Warburg for his efforts to help her find a teacher for Carl Georg Heise