Columbia subject headings:
Democracy--Europe--Congresses.
Europe--Social conditions--Congresses.
Ideology--Europe--History--Congresses.
Political science--Europe--History--Congresses.
Harvard subject headings:
Democracy--Europe--Congresses
Europe--Social conditions--1789-1900--Congresses.
Ideology--Europe--History--Congresses.
Political science--Europe--History--Congresses.
Princeton subject headings: