Columbia subject headings:
Water resources development--Research--United States.
Water--Pollution--Research--United States.
Water--Research--United States.
Harvard subject headings:
Hydrology--Research--United States.
Water quality--Research--United States.
Water resources development--Research--United States.
Water-supply--Research--United States.
Princeton subject headings:
Hydrology--Research--United States.
Water quality--Research--United States.
Water resources development--Research--United States.
Water-supply--Research--United States.