Columbia subject headings:
Military art and science--Early works to 1800.
Roman law.
Water-supply--Early work to 1800.
Water-supply--Early works to 1800.
Water-supply--Italy--Rome.
Harvard subject headings:
Military art and science--Early works to 1800
Water-supply--Early works to 1800.
Water-supply--Italy--Rome--Early works to 1800.
Water-supply--Rome.
Princeton subject headings: