Columbia subject headings:
Internal security--Poland--History--Sources.
Poland--Politics and government--1945-1980--Sources.
Poland--Politics and government--1980-1989--Sources.
Poland. Służba Bezpieczeństwa--Sources.
Harvard subject headings:
Internal security--Poland--History--Sources.
Poland--Politics and government--1945-1980--Sources.
Poland--Politics and government--1980-1989--Sources.
Poland. Służba Bezpieczeństwa--Sources.
Princeton subject headings: