Columbia subject headings:
Poland--History--1945-
Poland--Politics and government--1989-
Poland--Social conditions--1945-
Harvard subject headings:
Poland--History--1945-1980
Poland--Politics and government--1945-1980
Poland--Social conditions--1945-
Princeton subject headings:
Poland--History--1945-
Poland--Politics and government--1945- .
Poland--Social conditions--1945-