Columbia subject headings:
Harvard subject headings:
Chad--Foreign relations--France.
Chad--History--Civil War, 1965---Secret service.
France--Foreign relations--Chad.
Intelligence service--France--History--20th century.
Princeton subject headings:
Chad--Foreign relations--France.
Chad--History--Civil War, 1965---Secret service.
France--Foreign relations--Chad.
Intelligence service--France--History--20th century.