Columbia subject headings:
Harvard subject headings:
Poland--Politics and government--1945-1980--Sources.
Polska Partia Robotnicza--Party work--History--Sources.
Polska Partia Robotnicza. KC--History--Sources.
Princeton subject headings:
Poland--Politics and government--1945-1980--Sources.
Polska Partia Robotnicza--Party work--History--Sources.
Polska Partia Robotnicza. KC--History--Sources.