Columbia subject headings:
Harvard subject headings:
Mediterranean Region--Foreign relations--Spain--Congresses.
Mediterranean Region--History, Military--Congresses.
Mediterranean Region--Strategic aspects--Congresses.
Spain--Foreign relations--Mediterranean Region--Congresses.
Spain--History, Military--Congresses.
Princeton subject headings:
Mediterranean Region--Foreign relations--Spain--Congresses.
Mediterranean Region--History, Military--Congresses.
Mediterranean Region--Strategic aspects--Congresses.
Spain--Foreign relations--Mediterranean Region--Congresses.
Spain--History, Military--Congresses.