WIA FC/1897/13/1 | Jahns, Franziska to Warburg, Aby 09/12/1897 | encloses a card by Mrs. Flemming which he forgot to enclose in his letter of 14/10/1897; there... |
WIA FC/1928/3/1 | Derenberg, Louise to Warburg, Aby 06/08/1928 | Mrs. Cassirer informed her that her husband will stay in Hamburg; congratulates Warburg on this... |
WIA GC 1930/3582 | Bing, Gertrud to Warburg, Felix M. 15/07/1930 | |
WIA GC 1930/3583 | Bing, Gertrud to Warburg, Felix M. 19/09/1930 | |
WIA GC 1930/3585 | Warburg, Felix M. to Bing, Gertrud 16/10/1930 | |