Columbia subject headings:
Harvard subject headings:
Central Illustration Agency--History--20th century.
Espionage--Germany--History--20th century.
Germany--Politics and government--1945-1990.
Germany. Bundesnachrichtendienst--History--20th century.
Intelligence service--Germany--History--20th century.
Princeton subject headings:
Espionage--Germany--History--20th century.
Gehlen, Reinhard, 1902-1979.
Germany (West). Bundesnachrichtendienst--History--20th century.
Germany--Politics and government--1945-1990.
Intelligence service--Germany--History--20th century.
Internal security--Germany (West)
Organisation Gehlen--History.