WIA FC/1928/16/43 | Warburg, Aby to Warburg, Max 03/06/1928 | Warburg's considerations on the call by Frankfurt university to E. Cassirer; mentions Kurt... |
WIA GC/1928/1266 | Warburg, Aby to Kümmell, Hermann 01/07/1928 | thanks him for his letter of 30/06/1928; liked his newspaper article on the question of keeping... |
WIA GC/1928/1989 | Warburg, Aby to Bing, Gertrud 30/05/1928 | on his conversation with Cassirer, keeping Cassirer in Hamburg; mentions Kurt Riezler; mentions... |
WIA GC/1928/1990 | Riezler, Kurt to Warburg, Aby 16/07/1928 | thanks him for a copy of Warburg's article in the 'Hamburger Fremdenblatt' re Cassirer; Cassirer... |
WIA GC/1928/1991 | Warburg, Aby to Riezler, Kurt 18/07/1928 | thanks him for his letter; supplies further explanations why he has gone public in the Cassirer... |