WIA GC/1906/281 | 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/1906/282 | Hallier, Eduard to Warburg, Aby 02/10/1906 | on the lecture course discussed with Professor [Georg Johann] Pfeffer |
WIA GC/1908/517 | 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/1910/481 | Pfeffer, Georg Johann. to Warburg, Aby 21/11/1910 | explains that the mosquito Warburg caught was the common gnat; they have greatly increased in the... |
WIA GC/1917/618 | Pfeffer, Georg Johann to Warburg, Aby 20/07/1917 | on the [Robert] Münzel succession; recommends Wilhelm Waetzoldt who has the technical and... |