Columbia subject headings:
Harvard subject headings:
Democracy--Congresses
Equality--Congresses
Europe, Eastern--Languages--Political aspects--Congresses.
Europe, Western--Languages--Political aspects--Congresses.
European Union countries--Languages--Political aspects--Congresses.
Human rights--Congresses
Liberty--Congresses
Semantics--Political aspects--Congresses.
Princeton subject headings:
Democracy--Congresses.
Equality--Congresses.
European Union countries--Languages--Political aspects--Congresses.
Human rights--Congresses.
Liberty--Congresses.