WIA FC/1909/8/11 | Warburg, Max to Warburg, Aby 04/09/1909 | forwards a letter by Professor Albert Köster for Warburg to read before their meeting with E... |
WIA GC/1910/134 | Doren, Alfred to Warburg, Aby 05/06/1910 | he is a member of a number of art historical societies so that he does not want to join another... |
WIA GC/1910/355 | Köster, Albert to Warburg, Aby 19/04/1910 | returns books and photographs |
WIA GC/1910/356 | Köster, Albert to Warburg, Aby 11/05/1910 | thanks him for a copy of Warburg's article ['Die Wandbilder']; Warburg's judgment is very strict... |
WIA GC/1917/426 | Köster, Albert to Warburg, Aby 21/07/1917 | thanks him for the [Robert] Münzel obituary; would be very grateful if Warburg could send him one... |