Columbia subject headings:
Poland--Economic conditions--1945-
Poland--Politics and government--1945-1980.
Polska Zjednoczona Partia Robotnicza.
Working class--Poland.
Harvard subject headings:
NSZZ "Solidarność" (Labor organization)
Poland--Economic conditions--1945-
Poland--Economic conditions--1945-1981
Poland--Politics and government--1945-
Poland--Politics and government--1945-1980
Polska Zjednoczona Partia Robotnicza.
Working class--Poland.
Princeton subject headings:
Poland--Economic conditions--1945-1981.
Poland--Politics and government--1945-1980.
Polska Zjednoczona Partia Robotnicza.
Working class--Poland.