Columbia subject headings:
Canada--Relations--Great Britain.
Canada--Relations--United States.
Great Britain--Relations--Canada.
United States--Relations--Canada.
Harvard subject headings:
Canada--Relations--Great Britain.
Canada--Relations--United States.
Great Britain--Relations--Canada.
United States--Relations--Canada.
Princeton subject headings:
Canada--Relations--Great Britain.
Canada--Relations--United States.
Great Britain--Relations--Canada.
United States--Relations--Canada.