Columbia subject headings:
Castles--Italy--Friuli-Venezia Giulia--Guidebooks.
Harvard subject headings:
Castles--Italy--Friuli--Guidebooks.
Friuli (Italy)--Buildings, structures, etc.--Guidebooks.
Friuli (Italy)--Guidebooks.
Princeton subject headings:
Castles--Italy--Friuli-Venezia-Giulia--Guidebooks.
Friuli Venezia Giulia (Italy)--Guidebooks.
Guidebooks.