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