Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--United States.
Terrorism--Europe--Prevention
Terrorism--United States--Prevention
United States--Foreign relations--Europe.
War and emergency legislation--Europe.
War and emergency legislation--United States.
Princeton subject headings:
Europe--Foreign relations--United States.
Terrorism--Europe--Prevention.
Terrorism--United States--Prevention.
United States--Foreign relations--Europe.
War and emergency legislation--Europe.
War and emergency legislation--United States.