Columbia subject headings:
Aqueducts.
Fountains--Italy--Rome.
Fountains--Rome.
Harvard subject headings:
Aqueducts--Italy--Rome.
Fountains--Italy
Fountains--Italy--Rome
Rome (Italy)--Buildings, structures, etc.
Water-supply--Italy--Rome.
Princeton subject headings:
Aqueducts.
Fountains--Italy--Rome.
Rome (Italy)--Buildings, structures, etc.