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