BRIEF [O.A.] Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Dating: 24.02.1897
BRIEF [O.A.] Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Dating: 07.07.1898
POSTKARTE Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Dating: 28.12.1898
POSTKARTE Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Dating: 27.12.1899
BILDPOSTKARTE Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Corporation: Primo Congresso Universitatio Nazionale Anticlericale Dating: 15.02.1900
POSTKARTE Santoro-Silipigni, Giovanni Author: Santoro-Silipigni, Giovanni Recipient: Haeckel, Ernst Dating: 20.02.1904