BRIEF OHNE UMSCHLAG Strasburger, Eduard Author: Strasburger, Eduard Recipient: Haeckel, Ernst Dating: 12.09.1886
BRIEF OHNE UMSCHLAG Bothe, Margarete Author: Bothe, Margarete Recipient: Haeckel, Ernst Dating: 18.09.1915
BRIEF OHNE UMSCHLAG Eggeling, Heinrich von Author: Eggeling, Heinrich von Recipient: Haeckel, Ernst Dating: 24.08.1900
BRIEF OHNE UMSCHLAG Friederici, Erna Author: Friederici, Erna Recipient: Haeckel, Ernst Dating: 12.07.1914
BRIEF OHNE UMSCHLAG Umrath, Wilhelm Author: Umrath, Wilhelm Recipient: Haeckel, Ernst Dating: 01.04.1918
BRIEF OHNE UMSCHLAG Umrath, Wilhelm Author: Umrath, Wilhelm Recipient: Haeckel, Ernst Dating: 19.03.1918
BRIEF OHNE UMSCHLAG Umrath, Wilhelm Author: Umrath, Wilhelm Recipient: Haeckel, Ernst Dating: 17.12.1913
BRIEF OHNE UMSCHLAG Umrath, Wilhelm Author: Umrath, Wilhelm Recipient: Haeckel, Ernst Dating: 03.02.1906
BRIEF OHNE UMSCHLAG Umrath, Wilhelm Author: Umrath, Wilhelm Recipient: Haeckel, Ernst Dating: 30.03.1906