Columbia subject headings:
Intelligence service--Law and legislation--Poland.
Intelligence service--Poland--History--20th century.
Intelligence service--Political aspects--Poland--History.
Military intelligence--Poland--History--20th century.
Harvard subject headings:
Intelligence service--Law and legislation--Poland.
Intelligence service--Poland--History--20th century.
Intelligence service--Political aspects--Poland--History.
Military intelligence--Poland--History--20th century.
Princeton subject headings: