Columbia subject headings:
Harvard subject headings:
Roads, Roman--Italy--Marche--Congresses.
Roads--Italy--Marche--History--Congresses.
Transportation--Italy--Marche--History--Congresses.
Princeton subject headings:
Marche (Italy)--Antiquities--Congresses.
Marche (Italy)--History--Congresses.
Roads--Italy--Marche--History--Congresses.