Columbia subject headings:
Harvard subject headings:
Archaeology, Medieval--Italy--Marche--Congresses.
Human settlements--Italy--Marche--History--To 1500--Congresses.
Marche (Italy)--Antiquities--Congresses.
Marche (Italy)--History--Congresses.
Roads--Italy--Marche--History--To 1500--Congresses.
Princeton subject headings:
Marche (Italy)--Antiquities--Congresses.
Marche (Italy)--History--Congresses.