Columbia subject headings:
Harvard subject headings:
Poland--Economic conditions--1981-1990
Poland--Politics and government--1980---Congresses.
Poland--Politics and government--1989-
Poland--Social conditions--1980-
Poland--Social conditions--1980---Congresses.
Social indicators--Poland--Congresses.
Princeton subject headings:
Poland--Politics and government--20th century--Congresses.
Poland--Social conditions--20th century--Congresses.
Social indicators--Poland--Congresses.