BRIEF [O.A.] Focke, Gustav Waldemar Author: Focke, Gustav Waldemar Recipient: Haeckel, Ernst Dating: 29.10.1867
BRIEF [O.A.] Focke, Gustav Waldemar Author: Focke, Gustav Waldemar Recipient: Haeckel, Ernst Dating: 23.11.1867
BRIEF [O.A.] Dohrn, Carl August Author: Dohrn, Carl August Recipient: Haeckel, Ernst Dating: 28.06.1867
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.] Boettcher, Arthur Author: Boettcher, Arthur Recipient: Haeckel, Ernst Dating: 06.09.1867
