Columbia subject headings:
Castles--Italy--Piedmont--Guidebooks.
Piedmont (Italy)--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Castles--Italy--Piedmont--Guidebooks.
Piedmont (Italy)--Buildings, structures, etc.--Guidebooks.
Piedmont (Italy)--Guidebooks.
Piedmont (Italy)--History.
Princeton subject headings:
Castles--Italy--Piedmont--Guidebooks.
Guidebooks.
Piedmont (Italy)--Buildings, structures, etc.--Guidebooks.
Piedmont (Italy)--History.