Columbia subject headings:
Harvard subject headings:
Gaul--History--Gallic Wars, 58-51 B.C.
Measurement--History--Rome.
Military field engineering--Rome.
Rome--Army--Organization.
Princeton subject headings:
Gaul--History--Gallic Wars, 58-51 B.C.
Measurement--History--Rome.
Military field engineering--Rome.
Rome--Army--Organization.