Columbia subject headings:
Harvard subject headings:
Communism--Europe--History--20th century
Nineteen sixty-eight, A.D.
Protest movements--History--20th century.
Revolutions--History--20th century
Social conflict--History--20th century.
Social movements--History--20th century.
Social problems--History--20th century.
Student movements--History--20th century.
Princeton subject headings:
Germany (West)--Social conditions.
Labor movement--Germany (West).
Protest movements--Germany (West).
Socialism--Germany (West)
Student movements--Germany (West)