Columbia subject headings:
Harvard subject headings:
Crime prevention--Czechoslovakia--History--Congresses.
Crime prevention--Germany (East)--History--Congresses.
Crime--Czechoslovakia--History--Congresses.
Crime--Germany (East)--History--Congresses.
Deviant behavior--Czechoslovakia--History--Congresses.
Deviant behavior--Germany (East)--History--Congresses.
Police--Czechoslovakia--History--Congresses.
Police--Germany (East)--History--Congresses.
Security systems--Czechoslovakia--History--Congresses.
Security systems--Germany (East)--History--Congresses.
Princeton subject headings:
Crime prevention--Czechoslovakia--History--Congresses.
Crime prevention--Germany (East)--History--Congresses.
Crime--Czechoslovakia--History--Congresses.
Crime--Germany (East)--History--Congresses.
Deviant behavior--Czechoslovakia--History--Congresses.
Deviant behavior--Germany (East)--History--Congresses.
Police--Czechoslovakia--History--Congresses.
Police--Germany (East)--History--Congresses.
Security systems--Czechoslovakia--History--Congresses.
Security systems--Germany (East)--History--Congresses.