WIA GC/2142 | Pfeffer, Georg Johann to Warburg, Aby 22/08/1906 | topics for lectures are taken from the natural sciences and not from areas of Warburg's... |
WIA GC/2143 | Hallier, Eduard to Warburg, Aby 02/10/1906 | on the lecture course discussed with Professor [Georg Johann] Pfeffer |
WIA GC/3218 | Waetzoldt, Wilhelm to Warburg, Aby 10/03/1908 | thanks him for his reply and looks forward to receiving his advice; he cannot ask his old Hamburg... |
WIA GC/77 | Pfeffer, Georg Johann to Warburg, Aby 20/07/1917 | on the [Robert] Münzel succession; recommends Wilhelm Waetzoldt who has the technical and... |
WIA GC/78 | Warburg, Aby to Pfeffer, Georg Johann 20/07/1917 | cannot follow Pfeffer's suggestion about appointment of Wilhelm Waetzoldt as successor of Robert... |