WIA GC/1901/2 | Behn, Hermann to Warburg, Aby 07/11/1901 | dinner invitation |
WIA GC/1902/20 | Behn, Hermann to Warburg, Aby 03/01/1902 | thanks him for condolences and sends him New Year greetings |
WIA GC/1904/16 | Behn, Hermann to Warburg, Aby 11/04/1904 | he asks Warburg's help in locating a book mentioned by [Johann Wolfgang von] Goethe |
WIA GC/1910/42 | Behn, Hermann to Warburg, Aby 23/10/1910 | he is a member of the society; his address is wrong in the membership list; should he or would... |
WIA GC/1911/824 | Waetzoldt, Wilhelm to Warburg, Aby 26/07/1911 | lists the range of topics he could lecture on when in Hamburg; has Warburg read the 'reply' to... |