Columbia subject headings:
Communist countries--Foreign economic relations--United States.
Europe, Eastern--Foreign economic relations--United States.
United States--Foreign economic relations--Communist countries.
United States--Foreign economic relations--Europe, Eastern.
Harvard subject headings:
Communist countries--Foreign economic relations--United States.
Europe, Eastern--Foreign economic relations--United States.
United States--Foreign economic relations--Communist countries.
United States--Foreign economic relations--Europe, Eastern.
Princeton subject headings:
Communist countries--Foreign economic relations--United States.
Europe, Eastern--Foreign economic relations--United States.
United States--Foreign economic relations--Communist countries.
United States--Foreign economic relations--Europe, Eastern.