Columbia subject headings:
Soviet Union--Economic conditions.
Soviet Union--Economic policy.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Harvard subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1928-1932.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Princeton subject headings:
Soviet Union--Economic conditions--1917-1945.
Soviet Union--Economic policy--1928-1932.
Soviet Union--International relations--United States.
United States--International relations--Soviet Union.