Columbia subject headings:
Harvard subject headings:
Roads in art--Congresses.
Roads in literature--Congresses.
Transportation--Europe--History--To 1500--Congresses.
Princeton subject headings:
Highway communications--History--To 1500--Congresses.
Roads in literature--Congresses.
Roads--Design and construction--History--To 1500--Congresses.
Roads--History--To 1500--Congresses.