BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Focke, Wilhelm Olbers Dating: 27.10.1857
BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Ernst Dating: 16.07.1857
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Lachmann, Johannes Dating: 15.02.1857
BRIEF OHNE UMSCHLAG Sethe, Anna Author: Sethe, Anna Recipient: Haeckel, Charlotte; Haeckel, Ernst Dating: 26.03.1857
MANUSKRIPT Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 13.08.1857
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 29.05.1857
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Ehrenberg, Christian Gottfried Dating: 27.01.1857