WIA GC 1930/324
Binswanger, Ludwig to Bing, Gertrud 04/08/1930
WIA GC 1930/325
Binswanger, Ludwig to Bing, Gertrud 28/07/1930
WIA GC 1930/326
Bing, Gertrud to Binswanger, Ludwig 01/08/1930
WIA GC 1931/211
Binswanger, Ludwig to KBW 25/11/1931
WIA GC 1931/212
Binswanger, Ludwig to KBW 04/12/1931