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