Columbia subject headings:
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Visits of state--United States.
Harvard subject headings:
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Visits of state--United States
Princeton subject headings:
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Visits of state--United States.