Columbia subject headings:
Human rights--Congresses.
Revolution--Congresses.
Harvard subject headings:
Civil rights and socialism--Congresses.
Civil rights--Congresses
Democracy--Congresses
Human rights--Congresses
Revolutions--Congresses
Princeton subject headings:
Civil rights and socialism--Congresses.
Civil rights--Congresses.
Democracy--Congresses.
Human rights--Congresses.
Revolutions--Congresses.