BILDPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene von Dating: 02.04.1919
BILDPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene von Dating: 31.12.1909
BILDPOSTKARTE Eggeling, Heinrich von Author: Eggeling, Heinrich von Recipient: Haeckel, Ernst Dating: 03.09.1910
BILDPOSTKARTE Ficalbi, Eugenio; Ficalbi, Saffo Author: Ficalbi, Eugenio; Ficalbi, Saffo Recipient: Haeckel, Ernst Dating: 22.12.1914
BILDPOSTKARTE Eggeling, Heinrich von Author: Eggeling, Heinrich von Recipient: Haeckel, Ernst Dating: 01.11.1914
BILDPOSTKARTE Greshoff, Maurits Author: Greshoff, Maurits Recipient: Haeckel, Ernst Corporation: Koloniaal Museum Haarlem Dating: 14.11.1903