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 Crompton, Ella von Author: Crompton, Ella von Recipient: Haeckel, Ernst Dating: 30.08.1918
BILDPOSTKARTE Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 14.04.1906
BILDPOSTKARTE Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 05.11.1903
BILDPOSTKARTE Ernst Haeckel Author: Ernst Haeckel Recipient: Sprenger, Gustav; Sprenger, Therese Dating: 31.12.1910