Columbia subject headings:
Great Britain. Royal Air Force--Biography.
Hungerford, Charles Frederick Algernon Portal, Viscount Portal of, 1893-1971.
Marshals--Great Britain--Biography.
Harvard subject headings:
Generals--Great Britain--Biography
Great Britain. Royal Air Force--Biography.
Portal of Hungerford, Charles Frederick Algernon, Viscount.
World War, 1939-1945--Aerial operations, British.
Princeton subject headings:
Great Britain. Royal Air Force--Biography.
Hungerford, Charles Frederick Algernon Portal, Viscount Portal of, 1893-1971.
Marshals--Great Britain--Biography.