BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Focke, Wilhelm Olbers Dating: 27.10.1857
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Lachmann, Johannes Dating: 15.02.1857
BRIEF OHNE UMSCHLAG Beckmann, Otto Author: Beckmann, Otto Recipient: Haeckel, Ernst Dating: 02.03.1857
BRIEF OHNE UMSCHLAG Beckmann, Otto Author: Beckmann, Otto Recipient: Haeckel, Ernst Dating: 09.04.1857
BRIEF OHNE UMSCHLAG Beckmann, Otto Author: Beckmann, Otto Recipient: Haeckel, Ernst Dating: 17.07.1857
BRIEF OHNE UMSCHLAG Beckmann, Otto Author: Beckmann, Otto Recipient: Haeckel, Ernst Dating: 24.09.1857
BRIEF OHNE UMSCHLAG Beckmann, Otto Author: Beckmann, Otto Recipient: Haeckel, Ernst Dating: 24.10.1857