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