WIA GC/1890/13 | Hartz, Otto to Warburg, Aby 31/07/1890 | reports on the members of the student fraternity; H. B. deserves trust; [George] Melchior, his... |
WIA GC/1895/1 | Albrecht, Carl to Warburg, Aby 03/09/1895 | reminds him of the next 'Bonner Abend', in restaurant Alsterlust on 05/09/1895; wants to know... |
WIA GC/1906/2 | Warburg, Aby to Albrecht, Carl 21/01/1906 | supplies names of [A.] Dürer experts, [Oskar] Eisenmann in Kassel and [Max J.] Friedländer in Berlin |
WIA GC/1906/3 | Albrecht, Carl to Warburg, Aby 22/01/1906 | requests assistance with a Dürer attribution |
WIA GC/1910/1 | Albrecht, Carl to Warburg, Aby 18/06/1910 | requests Warburg to examine a painting in the estate of P. Th. Parey |