Columbia subject headings:
Harvard subject headings:
Democracy--Europe--History--Congresses.
Opposition (Political science)--Congresses.
Political participation--Europe--History--Congresses.
Representative government and representation--Europe--History--Congresses.
Princeton subject headings:
Democracy--Europe--History--Congresses.
Opposition (Political science)--Congresses.
Political participation--Europe--History--Congresses.
Representative government and representation--Europe--History--Congresses.