Columbia subject headings:
Communism--Poland.
Poland--Politics and government--1945-1980.
Poland--Politics and government--1980-1989.
Harvard subject headings:
Communism--Poland
Poland--Politics and government--1945-1980
Poland--Politics and government--1980-1989
Princeton subject headings:
Communism--Poland.
Poland--Politics and government--1945-1980.
Poland--Politics and government--1980-1989.