Columbia subject headings:
Harvard subject headings:
Berbers--Morocco--History--Congresses.
Europe--Relations--Morocco--Congresses.
Morocco--History--Congresses.
Morocco--Relations--Europe--Congresses.
Princeton subject headings:
Berbers--Morocco--History--Congresses.
Europe--Relations--Morocco--Congresses.
Morocco--History--Congresses.
Morocco--Relations--Europe--Congresses.