ANSICHTSKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Wildenbruch, Ernst von Dating: 31.12.1896
ANSICHTSKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Carneri, Bartholomäus von Dating: 05.01.1898
ANSICHTSKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Luria, Inéz Jost; Jost, Fritz Dating: 03.05.1915