Columbia subject headings:
Internal security--Poland--History--Sources.
Poland--Politics and government--1945-1980--Sources.
Harvard subject headings:
Internal security--Poland--History--Sources.
Poland--Politics and government--1945-1980--Sources.
Poland. Ministerstwo Bezpieczeństwa Publicznego--History--Sources.
Princeton subject headings:
Intelligence service--Poland--Sources.
Internal security--Poland--History--Sources.
Poland--Politics and government--1945-1980--Sources.
Poland--Politics and government--Sources.
Poland. Ministerstwo Bezpieczeństwa Publicznego--Records and correspondence.