Columbia subject headings:
Harvard subject headings:
Benelux countries--Relations--France--Congresses.
Benelux countries--Relations--Germany--Congresses.
Cooperation--European Union countries--History--20th century--Congresses.
France--Relations--Benelux countries--Congresses.
France--Relations--Germany--Congresses.
Germany--Relations--Benelux countries--Congresses.
Germany--Relations--France--Congresses.
Princeton subject headings:
Benelux countries--Relations--France--Congresses.
Benelux countries--Relations--Germany--Congresses.
Cooperation--European Union countries--History--20th century--Congresses.
France--Relations--Benelux countries--Congresses.
France--Relations--Germany--Congresses.
Germany--Relations--Benelux countries--Congresses.
Germany--Relations--France--Congresses.