Columbia subject headings:
Great Britain--Politics and government--19th century.
Great Britain--Politics and government--20th century.
Heads of state--Great Britain.
Harvard subject headings:
Great Britain--Politics and government--1837-1901
Great Britain--Politics and government--20th century.
Politicians--Great Britain--Biography
Prime ministers--Great Britain--Biography.
Princeton subject headings:
Great Britain--Politics and government--19th century.
Great Britain--Politics and government--20th century.
Prime ministers--Great Britain.