WIA GC/10031  | Friedländer, Max J. to Warburg, Aby 22/12/1892  | thanks him for a copy of his thesis; congratulates him; Hermann Ulmann explained it to him; he...  | 
WIA GC/10067  | Ulmann, Hermann to Warburg, Aby 25/04/1893  | Friedrich Bruckmann [Verlagsanstalt F. Bruckmann A.-G.] in Munich wants to use Warburg's...  | 
WIA GC/202  | Friedländer, Max J. to Warburg, Aby 21/09/1897  | informed Heinrich Brockhaus on the plans of the Ulmann family; he will inform [Hermann] Ulmann's...  | 
WIA GC/221  | Friedländer, Max J. to Warburg, Aby 31/12/1897  | [Hugo von] Tschudi will publish the document by Alfred Doren; advises Warburg to approach the...  | 
WIA GC/25287  | Warburg, Charlotte to Warburg, Aby 10/06/1888  | thanks him for letter; is sorry to read that he again suffers from hayfever; which doctor is...  |