WIA GC/1905/74 | Brons, Claas W. to Warburg, Aby 27/09/1905 | the Verein has coopted Warburg into the committee; requests Warburg whether he accepts membership |
WIA GC/1906/284 | Committee of Club von 1894, invitation, 11/04/1906 | invitation to attend the 84th meeting of the 'Club von 1894' in Uhlenhorst Fährhaus on 26/04/1906... |
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/1906/97 | Warburg, Aby to Bong, Richard 25/04/1906 | in response to an offer by Bong, Warburg replies as member of the committee of the 'Verein für... |
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... |