Columbia subject headings:
Military intelligence--Great Britain.
Oldfield, Maurice, Sir, 1915-1981.
World War, 1939-1945--Secret service--Great Britain.
Harvard subject headings:
Military intelligence--Great Britain.
Princeton subject headings:
Military intelligence--Great Britain.
Oldfield, Maurice, Sir, 1915-1981.
World War, 1939-1945--Secret service--Great Britain.