Columbia subject headings:
Harvard subject headings:
Drinking water--Purification--United States--Finance.
Federal aid to water quality management--United States
Sewage disposal--United States--Finance.
Water quality management--United States
Water--Pollution--Government policy--United States.
Princeton subject headings:
Drinking water--Purification--United States--Finance.
Federal aid to water quality management--United States.
Sewage disposal--United States--Finance.
Water quality management--United States.
Water--Pollution--Government policy--United States.