BRIEF [O.A.] Göttling, Carl Wilhelm Author: Göttling, Carl Wilhelm Recipient: Haeckel, Ernst Dating: 09.08.1867
BRIEF [O.A.] Gildemeister, E... Author: Gildemeister, E... Recipient: Haeckel, Ernst Dating: 15.01.1867
BRIEF [O.A.] Lampert, Friedrich Ernst Wilhelm Author: Lampert, Friedrich Ernst Wilhelm Recipient: Haeckel, Ernst Dating: 24.06.1867
BRIEF [O.A.] Marshall, William Author: Marshall, William Recipient: Haeckel, Ernst Dating: 12.01.1867