Columbia subject headings:
Espionage--Turkey--History.
Intelligence service--Turkey--History.
Subversive activities--Turkey--History.
Turkey--History--Revolution, 1918-1923--Secret service.
Harvard subject headings:
Espionage--Turkey.
Turkey--History--Revolution, 1918-1923.
Princeton subject headings:
Espionage--Turkey--History.
Intelligence service--Turkey--History.
Subversive activities--Turkey--History.
Turkey--History--Revolution, 1918-1923--Secret service.