BRIEF [O.A.] Dammer, Otto Author: Dammer, Otto Recipient: Haeckel, Ernst Corporation: Meyers Konversations-Lexikon, Redaktion Dating: 23.08.1896
BRIEF [O.A.] Dammer, Otto Author: Dammer, Otto Recipient: Haeckel, Ernst Corporation: Meyers Konversations-Lexikon, Redaktion Dating: 01.10.1896
BRIEF [O.A.] Dammer, Otto Author: Dammer, Otto Recipient: Haeckel, Ernst Corporation: Meyers Konversations-Lexikon, Redaktion Dating: 29.11.1896
BRIEF [O.A.] Dammer, Otto Author: Dammer, Otto Recipient: Haeckel, Ernst Corporation: Meyers Konversations-Lexikon, Redaktion Dating: 21.10.1904
BRIEF [O.A.] Dammer, Otto Author: Dammer, Otto Recipient: Haeckel, Ernst Corporation: Meyers Konversations-Lexikon, Redaktion Dating: 31.10.1904
BRIEF OHNE UMSCHLAG Davidsohn, Hermann Author: Davidsohn, Hermann Recipient: Haeckel, Ernst Dating: 12.05.1907
BRIEF OHNE UMSCHLAG Amplewitz, Rudolf Author: Amplewitz, Rudolf Recipient: Haeckel, Ernst Dating: 12.04.1911
BRIEF OHNE UMSCHLAG Amplewitz, Rudolf Author: Amplewitz, Rudolf Recipient: Haeckel, Ernst Dating: 06.06.1911