Columbia subject headings:
Castles--Italy--Trieste Region.
Castles--Karst (Slovenia and Italy : Region)
Karst (Slovenia and Italy : Region)--History.
Nobility--Italy--Trieste Region.
Nobility--Karst (Slovenia and Italy : Region)
Trieste Region (Italy)--History.
Harvard subject headings:
Castles--Italy--Trieste (Region)
Castles--Karst (Slovenia and Italy : Region)
Karst (Slovenia and Italy : Region)--History.
Nobility--Italy--Trieste (Region)
Nobility--Karst (Slovenia and Italy : Region)
Trieste Region (Italy)--History.
Princeton subject headings:
Castles--Karst (Region).
Karst (Slovenia and Italy : Region)--History.