KARTE Thiele, Carl Heinrich Author: Thiele, Carl Heinrich Recipient: Haeckel, Ernst Dating: 20.11.1916
KARTE Nebuschka, Marie Luise Author: Nebuschka, Marie Luise Recipient: Haeckel, Ernst Dating: 11.09.1916
KARTE Haeckel, Ernst Franz Max Author: Haeckel, Ernst Franz Max Recipient: Haeckel, Ernst Dating: 14.02.1916