Columbia subject headings:
Canada--Economic conditions--1991-
Canada--Foreign economic relations--United States.
United States--Economic conditions--1981-2001.
United States--Foreign economic relations--Canada.
Harvard subject headings:
Canada--Foreign economic relations--United States.
United States--Foreign economic relations--Canada.
Princeton subject headings:
Canada--Economic conditions--1991-
Canada--Foreign economic relations--United States.
United States--Economic conditions--1981-2001.
United States--Foreign economic relations--Canada.