Columbia subject headings:
Poland--Economic conditions--1945-
Poland--Economic conditions--1945-1981.
Poland--Politics and government--1945-1980.
Harvard subject headings:
Poland--Economic conditions--1945-
Poland--Economic conditions--1945-1981
Poland--Politics and government--1945-
Poland--Politics and government--1945-1980
Princeton subject headings:
Poland--Economic conditions--1945-1981.
Poland--Politics and government--1945-1980.