TELEGRAMM Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Corporation: Zoologisches Institut der Universität Jena Dating: 21.03.1908
TELEGRAMM Heldburg, Helene von Author: Heldburg, Helene von Recipient: Haeckel, Ernst Dating: 10.11.1908
TELEGRAMM Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 16.09.1908
TELEGRAMM Umrath, Marie, geb. Herbst Author: Umrath, Marie, geb. Herbst Recipient: Haeckel, Ernst Dating: 30.07.1908
TELEGRAMM Wille, Bruno; Westphal, ? [et al.] Author: Wille, Bruno; Westphal, ? [et al.] Recipient: Haeckel, Ernst Corporation: Freidenker-Kongress Dating: 12.06.1908