Columbia subject headings:
Democracy--Europe, Western--History--20th century--Congresses.
Terrorism--Europe, Western--Prevention--History--20th century--Congresses.
Terrorism--Government policy--Europe, Western--History--20th century--Congresses.
Harvard subject headings:
Democracy--Europe, Western--History--20th century--Congresses.
Europe, Western--Foreign relations--Congresses.
Internal security--Europe, Western--History--20th century--Congresses.
Security, International--Europe, Western--History--20th century--Congresses.
Terrorism--Europe, Western--History--20th century--Congresses.
Terrorism--Europe, Western--Prevention--History--20th century--Congresses.
Terrorism--Government policy--Europe, Western--Congresses.
Princeton subject headings:
Democracy--Europe, Western--History--20th century--Congresses.
Europe, Western--Foreign relations--Congresses.
Internal security--Europe, Western--History--20th century--Congresses.
Security, International--Europe, Western--History--20th century--Congresses.
Terrorism--Europe, Western--History--20th century--Congresses.
Terrorism--Europe, Western--Prevention--History--20th century--Congresses.
Terrorism--Government policy--Europe, Western--Congresses.