Columbia subject headings:
Harvard subject headings:
Espionage, German--France--History--20th century.
Mata Hari, 1876-1917
Spies--France--Biography.
World War, 1914-1918--Secret service--Germany
Princeton subject headings:
Espionage, German--France--History--20th century.
Mata Hari, 1876-1917.
Spies--France--Biography.
World War, 1914-1918--Secret service--Germany.