Columbia subject headings:
Morocco--Relations--Portugal--Congresses.
Morocco--Relations--Spain--Congresses.
Portugal--Relations--Morocco--Congresses.
Spain--Relations--Morocco--Congresses.
Harvard subject headings:
Morocco--Relations--Portugal--Congresses.
Morocco--Relations--Spain--Congresses.
Portugal--Relations--Morocco--Congresses.
Spain--Relations--Morocco--Congresses.
Princeton subject headings:
Morocco--Relations--Portugal--Congresses.
Morocco--Relations--Spain--Congresses.
Portugal--Relations--Morocco--Congresses.
Portugal--Relations--Spain--Congresses.
Spain--Relations--Morocco--Congresses.
Spain--Relations--Portugal--Congresses.