Columbia subject headings:
Fortification--Italy--Piedmont--History.
Stone buildings--Italy--Piedmont--History.
Harvard subject headings:
Fortification--Italy--Piedmont--History.
Stone buildings--Italy--Piedmont--History.
Princeton subject headings:
Fortification--Italy--Piedmont.
Piedmont (Italy)--Defenses.
Piedmont (Italy)--History, Military.