Columbia subject headings:
Communism--Poland--History--20th century.
Poland--Civilization--1945-
Poland--Politics and government--1945-1980.
Harvard subject headings:
Communism--Poland--History--20th century
Poland--Civilization--1945-
Poland--Politics and government--1945-1980
Princeton subject headings:
Communism--Poland--History--20th century.
Poland--Civilization--1945-
Poland--Politics and government--1945-1980.