Columbia subject headings:
Fortification--Designs and plans.
Fortification--Italy--Lucca--History.
Harvard subject headings:
City walls--Italy--Lucca.
Fortification--Early works to 1800
Fortification--Italy--Lucca.
Military architecture--Early works to 1800.
Princeton subject headings:
City walls--Italy--Lucca.
Fortification--Early works to 1800.
Fortification--Italy--Lucca.
Military architecture--Early works to 1800.