Columbia subject headings:
French newspapers--France--History--Congresses.
French periodicals--France--History--Congresses.
Postal service--France--History--Congresses.
Press--France--History--Congresses.
Harvard subject headings:
French newspapers--Circulation--Congresses.
French newspapers--France--History--Congresses.
French periodicals--Circulation--Congresses.
French periodicals--France--History--Congresses.
Postal service--France--Congresses.
Postal service--France--History--Congresses.
Press--France--History--Congresses.
Princeton subject headings:
French newspapers--Circulation--Congresses.
French periodicals--Circulation--Congresses.
Postal service--France--Congresses.