Columbia subject headings:
Espionage, German--Turkey.
Germany--Foreign relations--Turkey--20th century.
Military intelligence--Germany--History--20th century.
Spies--Germany.
Turkey--Foreign relations--Germany--20th century.
World War, 1939-1945--Secret service.
Harvard subject headings:
Germany--Foreign relations--Turkey.
Military intelligence--Germany--History--20th century.
Spies--Germany.
Turkey--Foreign relations--Germany--20th century.
World War, 1939-1945--Germany--Intelligence service.
Princeton subject headings:
Espionage, German--Turkey.
Germany--Foreign relations--Turkey--20th century.
Military intelligence--Germany--History--20th century.
Spies--Germany.
Turkey--Foreign relations--Germany--20th century.
World War, 1939-1945--Germany--Intelligence service.