BRIEF [O.A.] Sloman, Robert Miles jr. Author: Sloman, Robert Miles jr. Recipient: Haeckel, Ernst Dating: 27.02.1902
BRIEF [O.A.] Schild, Johann Author: Schild, Johann Recipient: Haeckel, Ernst Corporation: Deutsch-Australische-Dampfschiffs-Gesellschaft Dating: 13.03.1901
BRIEFABSCHRIFT Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 07.01.1886
BRIEF OHNE UMSCHLAG Harnier, Eduard von Author: Harnier, Eduard von Recipient: Haeckel, Ernst Dating: 30.05.1886
BRIEF OHNE UMSCHLAG Radonetz, Eduard Author: Radonetz, Eduard Recipient: Haeckel, Ernst Dating: 01.12.1885
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Eggeling, Heinrich von Dating: 05.01.1907
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Eggeling, Heinrich von Dating: 05.01.1907
