Columbia subject headings:
Canada--Foreign economic relations--Soviet Union.
East-West trade.
Soviet Union--Foreign economic relations--Canada.
Soviet Union--Foreign economic relations--United States.
United States--Foreign economic relations--Soviet Union.
Harvard subject headings:
Canada--Foreign economic relations--Soviet Union.
Soviet Union--Foreign economic relations--Canada.
Soviet Union--Foreign economic relations--United States.
United States--Foreign economic relations--Soviet Union.
Princeton subject headings:
Canada--Foreign economic relations--Soviet Union.
Soviet Union--Foreign economic relations--Canada.
Soviet Union--Foreign economic relations--United States.
United States--Foreign economic relations--Soviet Union.