Columbia subject headings:
Internal security--Germany--Congresses.
Terrorism--Prevention--Congresses.
Harvard subject headings:
Emergency management--Congresses
Interdisciplinary research--Congresses.
Internal security--Germany--Congresses.
Public safety--Research--Congresses.
Social change--Congresses
Terrorism--Prevention--Congresses
Princeton subject headings:
Internal security--Germany--Congresses.
Terrorism--Prevention--Congresses.