Columbia subject headings:
France. Direction générale des télécommunications--History.
Telecommunication policy--France--History--20th century.
Telecommunication--Economic aspects--France--History--20th century.
Telecommunication--France--History--20th century.
Harvard subject headings:
Orange (Firm)--History.
Telecommunication policy--France--History.
Telecommunication--France--History.
Princeton subject headings: