Columbia subject headings:
Arts--Germany--Rhineland--History--Congresses.
Europe, Western--Relations--Germany--Rhineland--Congresses.
Rhineland (Germany)--History--20th century--Congresses.
Rhineland (Germany)--Intellectual life--Congresses.
Rhineland (Germany)--Relations--Europe, Western--Congresses.
Harvard subject headings:
Cultural relations--Congresses.
Europe, Western--Relations--Germany--Rhineland--20th century--Congresses.
Europe, Western--Social life and customs--20th century--Congresses.
Rhineland (Germany)--Relations--Europe, Western--20th century--Congresses.
Rhineland (Germany)--Social life and customs--20th century--Congresses.
Princeton subject headings: