Columbia subject headings:
City walls--Italy--Lombardy--Congresses.
Excavations (Archaeology)--Italy--Lombardy--Congresses.
Lombardy (Italy)--Antiquities, Roman--Congresses.
Harvard subject headings:
City walls--Italy--Lombardy--Congresses.
Excavations (Archaeology)--Italy--Lombardy--Congresses.
Lombardy (Italy)--Antiquities, Roman--Congresses.
Princeton subject headings:
City walls--Italy--Lombardy--Congresses.
Excavations (Archaeology)--Italy--Lombardy--Congresses.
Lombardy (Italy)--Antiquities, Roman--Congresses.