Columbia subject headings:
Architecture--Italy--Ustica Island.
Church architecture--Italy--Ustica Island.
Fortification--Italy--Ustica Island.
Military architecture--Italy--Ustica Island.
Harvard subject headings:
Princeton subject headings:
Architecture--Italy--Ustica Island.
Church architecture--Italy--Ustica Island.
Fortification--Italy--Ustica Island.
Military architecture--Italy--Ustica Island.