BRIEF [O.A.] Lydecken, E... A... Author: Lydecken, E... A... Recipient: Haeckel, Ernst Dating: 01.10.1883
BRIEF [O.A.] Lydecken, E... A... Author: Lydecken, E... A... Recipient: Haeckel, Ernst Dating: 14.03.1883
BRIEF [O.A.] Kaulbars, Nicolai [Baron] Author: Kaulbars, Nicolai [Baron] Recipient: Haeckel, Ernst Dating: 21.12.1897
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 11.02.1892
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 05.01.1894
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 10.06.1899
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 05.04.1904
BRIEF [O.A.] Nottbeck, W... F... von Author: Nottbeck, W... F... von Recipient: Haeckel, Ernst Dating: 18.02.1898
BRIEF [O.A.] Sederholm, J... J... Author: Sederholm, J... J... Recipient: Haeckel, Ernst Dating: 03.07.1897