Columbia subject headings:
Terrorism victims' families--Services for--Germany--Berlin--Congresses.
Terrorism--Germany--Berlin--Congresses.
Victims of terrorism--Services for--Germany--Berlin--Congresses.
Harvard subject headings:
Terrorism--Germany--Berlin--History--21st century--Congresses.
Terrorists--Germany--Berlin--History--21st century--Congresses.
Victims of terrorism--Germany--Berlin--History--21st century--Congresses.
Princeton subject headings:
Terrorism victims' families--Services for--Germany--Berlin--Congresses.
Terrorism--Germany--Berlin--Congresses.
Victims of terrorism--Services for--Germany--Berlin--Congresses.