Columbia subject headings:
Coast defenses--Italy--Sardinia--History.
Military architecture--Italy--Sardinia--History.
Watchtowers--Italy--Sardinia--History.
Harvard subject headings:
Coast defenses--Italy--Sardinia--History.
Military architecture--Italy--Sardinia--History.
Watchtowers--Italy--Sardinia--History.
Princeton subject headings:
Coast defenses--Italy--Sardinia--History.
Military architecture--Italy--Sardinia--History.
Watchtowers--Italy--Sardinia--History.