Columbia subject headings:
Harvard subject headings:
Morocco--History--647-1516--Congresses.
Morocco--Relations--Spain--Congresses.
Spain--History--711-1516--Congresses.
Spain--Relations--Morocco--Congresses.
Princeton subject headings:
Africa, North--Civilization--Congresses.
Africa, North--Relations--Spain--Congresses.
Spain--Civilization--Congresses.
Spain--Relations--Africa, North--Congresses.