WIA GC/10809 | Warburg, Aby to Brandis, Otto 13/03/1908 | thanks him for his interest in the 'Deutscher Verein für Kunstwissenschaft'; hopes that he will join |
WIA GC/16381 | Melle, Werner von to Warburg, Aby 10/01/1925 | supplies reference for a Wilhelm von Humboldt quote; mentions Otto Brandis, Ferdinand von... |
WIA GC/19336 | Sieveking, Hermann Georg to Warburg, Aby 07/07/1927 | thanks him for his letter, the birthday greetings and for remembering his help in 1914; enthuses... |
WIA GC/2952 | Brandis, Otto to Warburg, Aby 12/03/1908 | apologizes for his late reply to Warburg's letter inviting him to join the new German Society... |
WIA GC/5040 | Brandis, Otto to Warburg, Aby [1913] | thanks him for photographs and the time he spent in his library |