Columbia subject headings:
Civilization--History--Congresses.
Ideology--History--Congresses.
State, The--History--Congresses.
Harvard subject headings:
Culture--History--Congresses.
Ideology--History--Congresses.
State, The--History--Congresses.
Princeton subject headings:
Culture--History--Congresses.
Ideology--History--Congresses.
State, The--History--Congresses.