TELEGRAMM Bismarck, Otto Fürst von Author: Bismarck, Otto Fürst von Recipient: Haeckel, Ernst Dating: 13.02.1894
TELEGRAMM Grimsehl, Carl; Gurlitt, Ludwig; Stabel Author: Grimsehl, Carl; Gurlitt, Ludwig; Stabel Recipient: Haeckel, Ernst Dating: 16.02.1912
TELEGRAMM Glock, Eduard Author: Glock, Eduard Recipient: Haeckel, Ernst Corporation: Neue Feuilleton Concern Dating: 19.07.1913