Columbia subject headings:
Harvard subject headings:
Authority--History--Congresses.
Europe--Intellectual life--Congresses.
Intellectual life--History--Congresses.
Pluralism--History--Congresses.
Princeton subject headings:
Authority--History--Congresses.
Europe--Intellectual life--Congresses.
Intellectual life--History--Congresses.
Pluralism--History--Congresses.