Columbia subject headings:
Harvard subject headings:
Arts--Germany--Rhineland--Congresses.
Rhineland (Germany)--Civilization--Congresses.
Rhineland (Germany)--History--20th century--Congresses.
Rhineland (Germany)--Intellectual life--Congresses.
World War, 1914-1918--Germany--Rhineland--Congresses.
Princeton subject headings:
Arts--Germany--Rhineland--Congresses.
Rhineland (Germany)--Civilization--Congresses.
Rhineland (Germany)--Intellectual life--Congresses.
World War, 1914-1918--Germany--Rhineland--Congresses.