BRIEF [O.A.] Deichmüller, J... Author: Deichmüller, J... Recipient: Haeckel, Ernst Corporation: Naturwissenschaftl. Gesellschaft JSIS Dating: 26.07.1893
BRIEF [O.A.] Erfurth, Hugo Author: Erfurth, Hugo Recipient: Haeckel, Ernst Corporation: Hugo Erfurth, Photographische Bildnisse Dating: 31.03.1915
BRIEF [O.A.] Geinitz, Hans Bruno Author: Geinitz, Hans Bruno Recipient: Haeckel, Ernst Dating: 08.03.1866
BRIEF [O.A.] Geinitz, Hans Bruno Author: Geinitz, Hans Bruno Recipient: Haeckel, Ernst Dating: 29.11.1865
BRIEF [O.A.] Geinitz, Hans Bruno Author: Geinitz, Hans Bruno Recipient: Haeckel, Ernst Dating: 04.12.1865
BRIEF [O.A.] Geinitz, Hans Bruno Author: Geinitz, Hans Bruno Recipient: Haeckel, Ernst Dating: 14.12.1865
BRIEF [O.A.] Geinitz, Hans Bruno Author: Geinitz, Hans Bruno Recipient: Haeckel, Ernst Dating: 03.01.1866
BRIEF [O.A.] Geinitz, Hans Bruno Author: Geinitz, Hans Bruno Recipient: Haeckel, Ernst Dating: 19.02.1885
