Columbia subject headings:
Aqueducts--Early works to 1800.
Aqueducts--Italy--Rome--Early works to 1800.
Water-supply--Early works to 1800.
Water-supply--Italy--Rome--Early works to 1800.
Harvard subject headings:
Acqueducts--Italy--Rome--Early works to 1800.
Water-supply--Early works to 1800.
Water-supply--Italy--Rome--Early works to 1800.
Princeton subject headings:
Aqueducts--Italy--Rome--Early works to 1800.
Water-supply--Early works to 1800.
Water-supply--Italy--Rome--Early works to 1800.