BILDPOSTKARTE Schuster, Adolf Niklaus Author: Schuster, Adolf Niklaus Recipient: Haeckel, Ernst Dating: 14.04.1906
BILDPOSTKARTE Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Corporation: Primo Congresso Universitatio Nazionale Anticlericale Dating: 15.02.1900
BILDPOSTKARTE Kraigher-Porges, Josepha Author: Kraigher-Porges, Josepha Recipient: Haeckel, Ernst Dating: 31.03.1902
BILDPOSTKARTE Kraigher-Porges, Josepha Author: Kraigher-Porges, Josepha Recipient: Haeckel, Ernst Dating: 01.01.1903
