Columbia subject headings:
Architecture, Medieval--Italy--Udine.
Fortification--Italy--Udine.
Towers--Italy--Udine.
Udine (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Medieval--Italy--Udine.
Fortification--Italy--Udine.
Towers--Italy--Udine.
Udine (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Medieval--Italy--Udine.
Fortification--Italy--Udine.
Towers--Italy--Udine.
Udine (Italy)--Buildings, structures, etc.