Columbia subject headings:
Canada--Politics and government.
Executive power--Canada.
Heads of state--Canada.
Monarchy--Canada.
Monarchy--Great Britain.
Harvard subject headings:
Canada--Politics and government.
Executive power--Canada.
Heads of state--Canada.
Monarchy--Canada.
Monarchy--Great Britain
Princeton subject headings:
Canada--Politics and government.
Executive power--Canada.
Heads of state--Canada.
Monarchy--Canada.
Monarchy--Great Britain.