WIA GC/1906/492 | Wilckens, B. [?] to Warburg, Aby 27/08/1906 | clarifies that he had not sent him an invitation to attend a meeting of the literature section of... |
WIA GC/1907/770 | Wilckens, B. to Warburg, Aby 30/05/1907 | Warburg was voted into the art section of the Verein and is now requested to convene a section... |
WIA GC/1907/771 | Verein für Kunst und Wissenschaft Hamburg to Warburg, Aby 17/06/1907 | invitation to a meeting of the literary section |
WIA GC/1907/772 | Verein für Kunst und Wissenschaft Hamburg to Warburg, Aby 30/11/1907 | invitation to a meeting of the art section |