Columbia subject headings:
Germany--Foreign relations--United States.
Intelligence service--Germany.
Intelligence service--United States.
United States--Foreign relations--Germany.
Harvard subject headings:
Germany--Foreign relations--United States.
Intelligence service--Germany.
Intelligence service--United States.
United States--Foreign relations--Germany.
Princeton subject headings:
Germany--Foreign relations--United States.
Intelligence service--Germany.
Intelligence service--United States.
United States--Foreign relations--Germany.