WIA FC/1922/9/13 | Warburg, Alice to Warburg, Aby 05/07/1922 | sends best wishes |
WIA FC/1912/1/2 | Derenberg, Julius to Warburg, Aby 03/04/1912 | a detailed account of mother's illness |
WIA GC/1909/117 | Eckardt, Felix von to Warburg, Aby 20/12/1909 | informs him that [G.?] Keyssner wants Warburg to read and review an essay |
WIA GC 1930/3389 | Wieder, Frederik Caspar to Warburg, Aby 24/12/1930 | |
WIA GC/1881/1 | Ollendorff, Oscar to Warburg, Aby 19/09/1881 | detailed account of his life in Johannisberg; he would prefer, though, to be with him at school |