BRIEF [O.A.] Liebern, W... Author: Liebern, W... Recipient: Haeckel, Ernst Corporation: Lese- und Redehalle der deutschen Studenten Dating: 05.08.1913
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Corporation: Zoologisches Institut
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Dating: 10.03.1907
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Dating: 04.10.1906
BRIEF [O.A.] Lendenfeld, Robert von Author: Lendenfeld, Robert von Recipient: Haeckel, Ernst Dating: 01.07.1905