Columbia subject headings:
Fortification--Italy--History--19th century.
Italy--Defenses--History--19th century.
Menabrea, Luigi Federico, 1809-1896.
Military architecture--Italy--History--19th century.
Harvard subject headings:
Fortification--Italy--History--19th century.
Italy--Defenses--History--19th century.
Menabrea, Luigi Federico, 1809-1896.
Military architecture--Italy--History--19th century.
Princeton subject headings:
Fortification--Italy--History--19th century.
Italy--Defenses--History--19th century.
Menabrea, Luigi Federico, 1809-1896.
Military architecture--Italy--History--19th century.