ANSICHTSKARTE Quincke, Georg; Quincke, R.; Quincke, Th. Author: Quincke, Georg; Quincke, R.; Quincke, Th. Recipient: Haeckel, Ernst Dating: 07.09.1905
POSTKARTE Lang-Bachelin, Mathilde Author: Lang-Bachelin, Mathilde Recipient: Haeckel, Ernst Dating: 16.02.1905