Columbia subject headings:
Harvard subject headings:
Human rights--Europe--Congresses
Prisoners--Civil rights--Europe--Congresses.
Prisoners--Legal status, laws, etc.--Europe--Congresses.
Prisons--Europe--Officials and employees--Training of--Congresses.
Princeton subject headings:
Prisoners--Legal status, laws, etc.--Europe--Congresses.
Prisons--Officials and employees--Training of--Europe--Congresses.