Columbia subject headings:
Harvard subject headings:
Europe--Politics and government--20th century--Congresses.
Europe--Politics and government--21st century--Congresses.
Human rights movements--Europe--History--Congresses.
Human rights workers--Europe--Societies, etc.--Congresses.
Human rights--Europe--History--Congresses.
Public interest groups--Europe--History--Congresses.
Princeton subject headings:
Europe--Politics and government--20th century--Congresses.
Europe--Politics and government--21st century--Congresses.
Human rights workers--Europe--Societies, etc.--Congresses.
Human rights--Europe--History--Congresses.
Public interest groups--Europe--History--Congresses.