BILDPOSTKARTE Ihering, Hermann von Author: Ihering, Hermann von Recipient: Haeckel, Ernst Dating: 23.04.1907
BILDPOSTKARTE Ihering, Hermann von Author: Ihering, Hermann von Recipient: Haeckel, Ernst Dating: 18.12.1910
BILDPOSTKARTE Ihering, Hermann von Author: Ihering, Hermann von Recipient: Haeckel, Ernst Dating: 13.12.1902
BILDPOSTKARTE Fleischmann, Alois Author: Fleischmann, Alois Recipient: Haeckel, Ernst Dating: 12.03.1914
BILDPOSTKARTE Fleischmann, Alois Author: Fleischmann, Alois Recipient: Haeckel, Ernst Dating: 13.03.1914