Columbia subject headings:
Water resources development--Italy--Tiber River Watershed--Congresses.
Water-supply--Italy--Tiber River Watershed--Congresses.
Watershed management--Italy--Tiber River Watershed--Congresses.
Harvard subject headings:
Water resources development--Italy--Tiber River Watershed--Congresses.
Water-supply--Italy--Tiber River Watershed--Congresses.
Watershed management--Italy--Tiber River Watershed--Congresses.
Princeton subject headings: