ANSICHTSKARTE Sprenger, Therese Author: Sprenger, Therese Recipient: Haeckel, Ernst Dating: 01.06.1914
ANSICHTSKARTE Wille, Bruno; Bölsche, Wilhelm; Wille, Lieschen Author: Wille, Bruno; Bölsche, Wilhelm; Wille, Lieschen Recipient: Haeckel, Ernst Dating: 21.09.1899