Columbia subject headings:
Harvard subject headings:
Europe--Politics and government--20th century--Congresses.
New Left--Europe--History--20th century--Congresses.
Social movements--Economic aspects--Europe--Congresses.
Social movements--Europe--History--20th century--Congresses.
Princeton subject headings:
Europe--Politics and government--20th century--Congresses.
New Left--Europe--History--20th century--Congresses.
Social movements--Economic aspects--Europe--Congresses.
Social movements--Europe--History--20th century--Congresses.