Columbia subject headings:
Harvard subject headings:
Beaulieu (England)--History.
Great Britain. Special Operations Executive
Intelligence officers--Training of--Great Britain--History--20th century.
Spies--Training of--Great Britain--History--20th century.
World War, 1939-1945--Secret service--Great Britain.
Princeton subject headings:
Beaulieu (England)--History.
Great Britain. Special Operations Executive
Intelligence officers--Training of--Great Britain--History--20th century.
Spies--Training of--Great Britain--History--20th century.
World War, 1939-1945--Secret service--Great Britain.