Columbia subject headings:
Arts--Germany--Mannheim--20th century--Congresses.
Mannheim (Germany)--Civilization--20th century--Congresses.
Mannheim (Germany)--History--20th century--Congresses.
Mannheim (Germany)--Intellectual life--20th century--Congresses.
Harvard subject headings:
Arts--Germany--Mannheim--20th century--Congresses.
Germany--History--1918-1933--Congresses.
Germany--Intellectual life--20th century.
Mannheim (Germany)--Civilization--20th century--Congresses.
Mannheim (Germany)--Intellectual life--20th century--Congresses.
Princeton subject headings: