Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--Italy--Congresses.
Italy--Foreign relations--20th century--Congresses.
Italy--Foreign relations--Europe--Congresses.
Italy--Foreign relations--United States--Congresses.
United States--Foreign relations--Italy--Congresses.
Princeton subject headings:
Italy--Foreign relations--20th century.
Italy--Politics and government--20th century.