BRIEF [O.A.] Gorzawsky, Hubert Author: Gorzawsky, Hubert Recipient: Haeckel, Ernst Dating: 23.09.1907
BRIEF [O.A.] Grube, Adolf Eduard Author: Grube, Adolf Eduard Recipient: Haeckel, Ernst Dating: 18.05.1870
BRIEF [O.A.] Grube, Adolf Eduard Author: Grube, Adolf Eduard Recipient: Haeckel, Ernst Dating: 21.01.1871
BRIEF [O.A.] Grube, Adolf Eduard Author: Grube, Adolf Eduard Recipient: Haeckel, Ernst Dating: 20.10.1876
BRIEF [O.A.] Grube, Adolf Eduard Author: Grube, Adolf Eduard Recipient: Haeckel, Ernst Dating: 14.12.1876
BRIEF [O.A.] Grube, Adolf Eduard Author: Grube, Adolf Eduard Recipient: Haeckel, Ernst Dating: 01.01.1877