Columbia subject headings:
Agriculture--Economic aspects--Ontario--History.
Agriculture--Economic aspects--Québec (Province)--History.
Ontario--Economic conditions.
Québec (Province)--Economic conditions.
Harvard subject headings:
Agriculture--Economic aspects--Ontario--History.
Agriculture--Economic aspects--Québec (Province)--History.
Ontario--Economic conditions.
Québec (Province)--Economic conditions.
Princeton subject headings: