Columbia subject headings:
Irrigation--Government policy--Congresses.
Water quality management--Government policy--Congresses.
Water resources development--Government policy--Congresses.
Water-supply, Agricultural--Government policy--Congresses.
Harvard subject headings:
Irrigation--Government policy--Congresses.
Water quality management--Government policy--Congresses.
Water resources development--Government policy--Congresses.
Water-supply, Agricultural--Government policy--Congresses.
Princeton subject headings:
Irrigation--Government policy--Congresses.
Water quality management--Government policy--Congresses.
Water resources development--Government policy--Congresses.
Water-supply, Agricultural--Government policy--Congresses.