Columbia subject headings:
Canada--Foreign relations--1914-1945.
Canada--Foreign relations--1945-
Canada--Foreign relations--Great Britain.
Canada--Foreign relations--United States.
Great Britain--Foreign relations--20th century.
Great Britain--Foreign relations--Canada.
Great Britain--Foreign relations--United States.
United States--Foreign relations--20th century.
United States--Foreign relations--Canada.
United States--Foreign relations--Great Britain.
Harvard subject headings:
Canada--Foreign relations--1914-1945.
Canada--Foreign relations--1945-
Canada--Foreign relations--20th century.
Canada--Foreign relations--Great Britain.
Canada--Foreign relations--United States.
Great Britain--Foreign relations--20th century.
Great Britain--Foreign relations--Canada.
Great Britain--Foreign relations--United States.
United States--Foreign relations--20th century.
United States--Foreign relations--Canada.
United States--Foreign relations--Great Britain.
Princeton subject headings: