Columbia subject headings:
Harvard subject headings:
Espionage--Germany--History--20th century.
Germany--Foreign relations--1945-
Germany. Bundesnachrichtendienst.
Intelligence service--Germany--History--20th century.
Intelligence service--United States--History--20th century
Military intelligence--Germany--History--20th century.
Organisation Gehlen.
Spies--Germany--History--20th century.
United States. Central Intelligence Agency
Princeton subject headings:
Espionage--Europe.
Germany. Bundesnachrichtendienst