Columbia subject headings:
Elections--Corrupt practices--Poland--History.
Poland--Politics and government--1945-1980.
Political parties--Poland--History.
Polska Partia Robotnicza--History.
Referendum--Poland--History.
Referendum--Poland--Statistics.
Representative government and representation--Poland--History.
Harvard subject headings:
Poland--Politics and government--1945-1980--Sources.
Referendum--Poland--Sources.
Princeton subject headings:
Poland--Politics and government--1945-1980--Sources.
Poland--Politics and government--1945-1980--Statistics.
Referendum--Poland--Sources.
Referendum--Poland--Statistics.