Columbia subject headings:
Harvard subject headings:
Europe--Economic integration--Congresses.
Germany (West)--Foreign relations--Greece--Congresses.
Germany--Relations--Greece--Congresses.
Greece--Foreign relations--Germany (West)--Congresses.
Greece--Relations--Germany--Congresses.
Princeton subject headings:
Germany (West)--Foreign relations--Greece--Congresses.
Greece--Foreign relations--Germany (West)--Congresses.