WIA GC/17290 | Bing, Gertrud to Warburg, Aby 16/09/1926 | thanks him for letters; she wrote to Gundel; re Max Georg Schmidt: includes a letter from the... |
WIA GC/20521 | Keller-Huguenin, Eugen to Warburg, Aby 03/03/1928 | complains about Switzerland, his life there; admits to resignation; enjoys his trips to Paris... |