Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--Europe.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Princeton subject headings:
Europe--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Europe.
Soviet Union--Foreign relations--United States.
Soviet Union--Foreign relations.
United States--Foreign relations--Soviet Union.