Columbia subject headings:
Civil rights--Europe.
Europe--Social conditions--20th century--Congresses.
Human rights--Europe--Congresses.
Human rights--Europe.
Non-governmental organizations--Congresses.
Non-governmental organizations.
Organization for Security and Co-operation in Europe.
Harvard subject headings:
Princeton subject headings:
Europe--Social conditions--20th century--Congresses.
Human rights--Europe--Congresses.
Non-governmental organizations--Congresses.