Columbia subject headings:
Fortification--Italy--Lucca.
Lucca (Italy)--Buildings, structures, etc.
Lucca (Italy)--History.
Harvard subject headings:
City walls--Italy--Lucca--History.
Fortification--Italy--Lucca--History.
Lucca (Italy)--Buildings, structures, etc.
Military architecture--Italy--Lucca.
Princeton subject headings:
City walls--Italy--Lucca (Province)--History.
Fortification--Italy--Lucca (Province)--History.
Lucca (Italy : Province)--Buildings, structures, etc.
Military architecture--Italy--Lucca (Province).