Columbia subject headings:
Great Britain--History--20th century.
Harvard subject headings:
Great Britain--History--20th century.
History, Modern--20th century
World War, 1914-1918--Europe--History.
World War, 1914-1918--Great Britain--History.
World War, 1939-1945--Europe--History.
World War, 1939-1945--Great Britain--History.
World politics--20th century
Princeton subject headings:
Great Britain--History--20th century.