BRIEF OHNE UMSCHLAG Kirchmann, Anna von Author: Kirchmann, Anna von Recipient: Haeckel, Ernst Dating: 19.08.1908
BRIEF [O.A.] Ivezic, Gerassim P... Author: Ivezic, Gerassim P... Recipient: Haeckel, Ernst Dating: 01.06.1908
TELEGRAMM Schönfeld, Engelbert Author: Schönfeld, Engelbert Recipient: Haeckel, Ernst Dating: 16.02.1908
BRIEF [O.A.] Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 26.12.1908