Columbia subject headings:
Europe, Central--Politics and government--Congresses.
Europe, Central--Social conditions--Congresses.
Europe, Eastern--Politics and government--Congresses.
Europe, Eastern--Social conditions--Congresses.
Socialism--Europe, Central--Congresses.
Socialism--Europe, Eastern--Congresses.
Harvard subject headings:
Europe, Central--Politics and government--1989---Congresses.
Europe, Central--Politics and government--Congresses.
Europe, Central--Social conditions--Congresses.
Europe, Eastern--Politics and government--1989---Congresses.
Europe, Eastern--Politics and government--Congresses.
Europe, Eastern--Social conditions--Congresses.
Socialism--Europe, Central--Congresses.
Socialism--Europe, Eastern--Congresses.
Princeton subject headings:
Europe, Central--Politics and government.
Europe, Eastern--Politics and government.