Columbia subject headings:
Harvard subject headings:
Europe--Economic integration--Congresses.
European Union--Congresses.
European Union--Germany--Congresses.
European Union--Poland--Congresses.
European Union--Public opinion--Congresses.
Princeton subject headings:
European Union--Congresses.
Poland--Politics and government--1989---Congresses.
Poland--Social conditions--1980---Congresses.