Columbia subject headings:
Harvard subject headings:
Labor movement--Poland--History--20th century.
Labor unions--Poland--History--20th century.
NSZZ "Solidarność" (Labor organization)
Poland--Economic conditions--1945-1981
Princeton subject headings:
Labor movement--Poland--History--20th century.
Labor unions--Poland--History--20th century.
NSZZ "Solidarność" (Labor organization)
Poland--Economic conditions--1945-