BRIEF [O.A.] Luerssen, Christian Author: Luerssen, Christian Recipient: Haeckel, Ernst Dating: 22.10.1868
BRIEF [O.A.] Lewes, George Henry Author: Lewes, George Henry Recipient: Haeckel, Ernst Dating: 17.02.1868
BRIEF [O.A.] Lewes, George Henry Author: Lewes, George Henry Recipient: Haeckel, Ernst Dating: 29.08.1868
BRIEF [O.A.] Lewes, George Henry Author: Lewes, George Henry Recipient: Haeckel, Ernst Dating: 11.02.1868
BRIEF [O.A.] Miklucho-Maclay, Nikolaj N... Author: Miklucho-Maclay, Nikolaj N... Recipient: Haeckel, Ernst Dating: 18.03.1868
BRIEF [O.A.] Miklucho-Maclay, Nikolaj N... Author: Miklucho-Maclay, Nikolaj N... Recipient: Haeckel, Ernst Dating: 02.10.1868