WIA GC/11211 | Warburg, Aby to Uhde-Bernays, Hermann 20/02/1910 | Warburg promises to support Uhde-Bernays' efforts to give lectures in Hamburg; advises him to... |
WIA GC/1531 | Bonfort, Helene to Warburg, Aby 19/01/1905 | Warburg might possibly be approached by Heinrich Spiero from Berlin, who wants to establish an... |
WIA GC/1918 | Spiero, Heinrich to Warburg, Aby 19/01/1905 | wants to discuss with Warburg a project, the founding a society of the arts |
WIA GC/1919 | Spiero, Heinrich to Warburg, Aby 20/01/1905 | sends apologies for not coming to the meeting; he will contact him in the near future |
WIA GC/3174 | Schultze, Ernst to Warburg, Aby 11/07/1908 | thanks Warburg for returning the letters; cannot understand Dr. [Rudolf?] Brach's point of view... |