Columbia subject headings:
Poland--Politics and government--1989-
Polska Zjednoczona Partia Robotnicza--History.
Harvard subject headings:
Poland--Politics and government--1945-
Poland--Politics and government--1945-1980
Poland--Politics and government--1980-1989
Polska Zjednoczona Partia Robotnicza--History.
Princeton subject headings:
Poland--Politics and government--1945-1980.
Poland--Politics and government--1980-1989.
Polska Zjednoczona Partia Robotnicza--History.