BILDPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene von Dating: 31.12.1909
BILDPOSTKARTE Grimsehl, Hellmuth Author: Grimsehl, Hellmuth Recipient: Haeckel, Ernst Dating: 18.02.1909
BILDPOSTKARTE Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 01.01.1909
BILDPOSTKARTE Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 16.05.1909
BILDPOSTKARTE Haeckel, Walther Author: Haeckel, Walther Recipient: Haeckel, Ernst; Haeckel, Agnes [Eltern] Dating: 10.04.1909