Columbia subject headings:
Harvard subject headings:
Europe--Antiquities--Congresses
France--Antiquities--Congresses
Transportation--Europe--History--To 1500--Congresses.
Transportation--France--History--To 1500--Congresses.
Princeton subject headings:
Europe--Antiquities--Congresses.
France--Antiquities--Congresses.
Transportation--Europe--History--To 1500--Congresses.
Transportation--France--History--To 1500--Congresses.