Columbia subject headings:
Harvard subject headings:
Bulgaria--Politics and government--1990---Congresses.
Bulgaria--Social conditions--1989---Congresses.
European Union--Bulgaria--Congresses.
Post-communism--Bulgaria--Congresses.
Princeton subject headings:
Bulgaria--Politics and government--1990---Congresses.
Bulgaria--Social conditions--1989---Congresses.
European Union--Bulgaria--Congresses.
Post-communism--Bulgaria--Congresses.