Columbia subject headings:
Castelnuovo (Padua, Italy)
City walls--Italy--Padua--History.
Fortification--Italy--Padua--History.
Padua (Italy)--Buildings, structures, etc.
Harvard subject headings:
Castelnuovo (Padua, Italy)
City walls--Italy--Padua--History.
Fortification--Italy--Padua--History.
Padua (Italy)--Buildings, structures, etc.
Princeton subject headings: