BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 16.10.1859
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: 18.02.1897
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Peters, Wilhelm Dating: 17.03.1860
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Anna Dating: 31.12.1859
BRIEF OHNE UMSCHLAG Schultze, Leonhard Author: Schultze, Leonhard Recipient: Haeckel, Ernst Dating: 18.04.1900
BRIEF OHNE UMSCHLAG Schultze, Leonhard Author: Schultze, Leonhard Recipient: Haeckel, Ernst Dating: 29.04.1900