Columbia subject headings:
Berlin (Germany)--Strategic aspects.
Cold War--History--Sources.
Espionage, American--Germany--Berlin.
Intelligence service--Germany--Berlin.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
United States. Central Intelligence Agency--History--Sources.
Harvard subject headings:
Berlin (Germany)--Strategic aspects.
Cold War--History--Sources.
Espionage, American--Germany--Berlin.
Intelligence service--Germany--Berlin.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
United States. Central Intelligence Agency--History--Sources.
Princeton subject headings:
Berlin (Germany)--Strategic aspects.
Cold War--Sources.
Espionage, American--Germany--Berlin.
Intelligence service--Germany--Berlin.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
United States. Central Intelligence Agency--History--Sources.