BRIEF [O.A.] Grube, Adolf Eduard Author: Grube, Adolf Eduard Recipient: Haeckel, Ernst Dating: 20.10.1869
BRIEF [O.A.] Gildemeister, E... Author: Gildemeister, E... Recipient: Haeckel, Ernst Dating: ??.04.1869
BRIEF [O.A.] Gildemeister, E... Author: Gildemeister, E... Recipient: Haeckel, Ernst Dating: 01.11.1869
BRIEF [O.A.] Gildemeister, E... Author: Gildemeister, E... Recipient: Haeckel, Ernst Dating: 08.10.1869
