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 1930/1770 | Bing, Gertrud to Kriegbaum, Friedrich 18/01/1930 | |
WIA GC 1930/1771 | Kriegbaum, Friedrich to Bing, Gertrud 29/01/1930 | |
WIA GC 1930/1772 | Kriegbaum, Friedrich to Bing, Gertrud 15/02/1930 | |
WIA GC 1930/1773 | Bing, Gertrud to Kriegbaum, Friedrich 25/02/1930 | |