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