Columbia subject headings:
Labor unions--Political activity--Poland--History--Congresses.
NSZZ "Solidarność" (Labor organization)--Political activity--History--Congresses.
Poland--Politics and government--1980-1989--Congresses.
Poland--Politics and government--1989---Congresses.
Harvard subject headings:
Labor unions--Political activity--Poland--History--Congresses.
NSZZ "Solidarność" (Labor organization)--Political activity--History--Congresses.
Poland--Politics and government--1980-1989--Congresses.
Poland--Politics and government--1989---Congresses.
Princeton subject headings: