BRIEF [O.A.] Schulz Curtius, Alfred Author: Schulz Curtius, Alfred Recipient: Haeckel, Ernst Dating: 13.01.1886
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Dating: 18.12.1886
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Dating: 09.11.1886
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Dating: 04.07.1886