Columbia subject headings:
Air raid shelters--Italy.
Civilization, Subterranean.
Excavations (Archaeology)--Italy.
Italy--Antiquities.
Underground architecture.
Underground areas.
Harvard subject headings:
Air raid shelters--Italy--Congresses.
Excavations (Archaeology)--Italy--Congresses
Italy--Antiquities--Congresses.
Princeton subject headings:
Air raid shelters--Italy.
Civilization, Subterranean.
Excavations (Archaeology)--Italy.
Italy--Antiquities.
Underground architecture.
Underground areas.