BRIEF OHNE UMSCHLAG Geuther, Anton Author: Geuther, Anton Recipient: Haeckel, Ernst Dating: 02.05.1884
BRIEF OHNE UMSCHLAG Fischer, Gustav Author: Fischer, Gustav Recipient: Haeckel, Ernst Corporation: Gustav Fischer, Verlagsbuchhandlung Dating: 01.12.1884
BRIEF OHNE UMSCHLAG Eggeling, Heinrich von Author: Eggeling, Heinrich von Recipient: Haeckel, Ernst Dating: 11.10.1884
BRIEF OHNE UMSCHLAG Eggeling, Heinrich Author: Eggeling, Heinrich Recipient: Haeckel, Ernst Dating: 21.10.1884
BRIEF [O.A.] Drewenthal, Wilhelm Author: Drewenthal, Wilhelm Recipient: Haeckel, Ernst Dating: 16.09.1884
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Möbius, Karl August Dating: 19.06.1884