Columbia subject headings:
Harvard subject headings:
Africa, North--History--Congresses.
Africa, North--Relations--Spain--Congresses.
Melilla (Spain)--History--Congresses.
Morocco--History--Congresses.
Spain--History--Congresses.
Spain--Relations--Africa, North--Congresses.
Princeton subject headings:
Africa, North--Relations--Spain--Congresses.
Melilla (Spain)--History--Congresses.
Spain--Relations--Africa, North--Congresses.