Columbia subject headings:
Eisenhower, Dwight D. (Dwight David), 1890-1969.
Khrushchev, Nikita Sergeevich, 1894-1971.
U-2 Incident, 1960.
Harvard subject headings:
Eisenhower, Dwight D. (Dwight David), 1890-1969
Khrushchev, Nikita Sergeevich, 1894-1971.
U-2 Incident, 1960.
Princeton subject headings:
Eisenhower, Dwight D. (Dwight David), 1890-1969.
Khrushchev, Nikita Sergeevich, 1894-1971.
U-2 Incident, 1960.