Columbia subject headings:
Canada--Foreign economic relations--United States--Congresses.
United States--Foreign economic relations--Canada--Congresses.
Harvard subject headings:
Canada--Foreign economic relations--United States--Congresses.
United States--Foreign economic relations--Canada--Congresses.
Princeton subject headings:
Canada--Foreign economic relations--United States--Congresses.
United States--Foreign economic relations--Canada--Congresses.