Columbia subject headings:
Harvard subject headings:
World War, 1939-1945--Military intelligence.
World War, 1939-1945--Portugal.
World War, 1939-1945--Spain.
Princeton subject headings:
Fleming, Ian, 1908-1964.
World War, 1939-1945--Portugal.
World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Spain.