Columbia subject headings:
Mediterranean Region--Foreign relations--Congresses.
Mediterranean Region--History, Military--Congresses.
Mediterranean Region--History--Congresses.
Harvard subject headings:
Mediterranean Region--Foreign relations--Congresses.
Mediterranean Region--History, Military--Congresses.
Mediterranean Region--History--Congresses.
Straits--Mediterranean Sea--History--Congresses.
Princeton subject headings:
Mediterranean Region--Foreign relations--Congresses.
Mediterranean Region--History, Military--Congresses.
Mediterranean Region--History--Congresses.