WIA GC/10364 | Warburg, Aby to Robinow, Richard 16/06/1906 | Rudolf Guba is talented and needs to be supported; he needs to get away from his father and study... |
WIA GC/10416 | Warburg, Aby to Wolffson, Albert 23/08/1906 | requests funds to educate Rudolf Guba, a 'Malerknabe', a young man, R. Guba with artistic talents |
WIA GC/11256 | Warburg, Aby to Wolffson, Albert 23/06/1910 | Dr. [Wilhelm] Waetzoldt would like to have a look at the Kupferstichsammlung before replying to... |
WIA GC/11284 | Warburg, Aby to Marr, Heinz 22/11/1910 | supplies names of people Marr ought to invite as well; [Heinrich?] Embden is prepared to bring... |
WIA GC/23422 | Wolffson, Albert to Warburg, Aby [1910] | thanks him for a copy of his article ['Die Wandbilder'] |