BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 24.09.1867
BRIEF OHNE UMSCHLAG Huschke, Agnes Author: Huschke, Agnes Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 19.06.1867