WIA FC/1928/8/62 | Warburg, Aby to Warburg, Mary 21/11/1928 | sends greetings from a dinner party; Eva and Alfred Neumeyer sign, Gertrud Bing signs |
WIA FC/1929/16/9 | Warburg, Aby to Warburg, Max 25/03/1929 | is pleased that H. Eckener remembers Warburg so well; accepts Max Warburg's view of Carl [Wilhelm... |
WIA GC 1930/2286 | Bing, Gertrud to Neumeyer, Alfred 07/01/1930 | |
WIA GC 1930/2287 | Neumeyer, Alfred to Bing, Gertrud 03/07/1930 | |
WIA GC 1930/2288 | Bing, Gertrud to Neumeyer, Alfred 08/07/1930 | |