Columbia subject headings:
Harvard subject headings:
Intelligence service--Poland--History--20th century.
Military intelligence--Poland--History--20th century.
Poland--History--1918-1945
Police--Poland--History--20th century.
Princeton subject headings:
Intelligence service--Poland--History--20th century.
Military intelligence--Poland--History--20th century.
Poland--History--1918-1945.
Police--Poland--History--20th century.