BRIEF [O.A.] Wießner, Alexander Author: Wießner, Alexander Recipient: Haeckel, Ernst Dating: 03.07.1875
BRIEF OHNE UMSCHLAG Weismann, August Author: Weismann, August Recipient: Haeckel, Ernst Dating: 27.12.1875
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 16.08.1875
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 13.11.1875
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 19.11.1875
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 06.12.1875
BRIEF OHNE UMSCHLAG Weismann, August Author: Weismann, August Recipient: Haeckel, Ernst Dating: 22.12.1875
BRIEF [O.A.] Schmertzing, Adolf Author: Schmertzing, Adolf Recipient: Haeckel, Ernst Dating: 21.01.1875