Columbia subject headings:
France. Ministère des postes, télégraphes et téléphones--History.
Postal service--France--History--20th century.
Telecommunication--France--History--20th century.
Harvard subject headings:
France. Ministère des postes, télégraphes et téléphones--History.
Postal service--France--History--20th century.
Telecommunication--France--History--20th century.
Princeton subject headings:
France. Ministère des postes, télégraphes et téléphones--History.
Postal service--France--History--20th century.
Telecommunication--France--History--20th century.