Columbia subject headings:
Canada--Economic conditions--Bibliography.
Canada--Social conditions--Bibliography.
United States--Economic conditions--Bibliography.
United States--Social conditions--Bibliography.
Harvard subject headings:
Canada--Economic conditions--Bibliography.
Canada--Social conditions--Bibliography.
United States--Economic conditions--Bibliography.
United States--Social conditions--Bibliography.
Princeton subject headings:
Canada--Economic conditions--Bibliography.
Canada--Social conditions--Bibliography.
United States--Economic conditions--Bibliography.
United States--Social conditions--Bibliography.