BRIEF [O.A.] Evans, Elizabeth E... Author: Evans, Elizabeth E... Recipient: Haeckel, Ernst Dating: 21.05.1905
TELEGRAMM Douwes Dekker, Eduard Author: Douwes Dekker, Eduard Recipient: Haeckel, Ernst Dating: 16.02.????
POSTKARTE Lehmann, Julius Friedrich Author: Lehmann, Julius Friedrich Recipient: Haeckel, Ernst Corporation: Deutsche Gesellschaft für Rassenhygiene Dating: 22.01.1918
BRIEF [O.A.] Dove, Alfred Author: Dove, Alfred Recipient: Haeckel, Ernst Corporation: Redaction der Allgemeinen Zeitung Dating: 20.07.1892
BRIEF [O.A.] Dove, Alfred Author: Dove, Alfred Recipient: Haeckel, Ernst Corporation: Redaction der Allgemeinen Zeitung Dating: 23.07.1892
TELEGRAMM Du Moulin-Eckart, Richard Graf Author: Du Moulin-Eckart, Richard Graf Recipient: Haeckel, Ernst Dating: 16.02.1904
BRIEF [O.A.] Dove, Alfred Author: Dove, Alfred Recipient: Haeckel, Ernst Corporation: Redaction der Allgemeinen Zeitung Dating: 23.08.1892