Columbia subject headings:
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--1929-1933.
United States--Foreign relations--1933-1945.
United States--Foreign relations--Soviet Union.
Harvard subject headings:
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--1929-1933.
United States--Foreign relations--1933-1945.
United States--Foreign relations--Soviet Union.
Princeton subject headings:
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.