Columbia subject headings:
Acid rain--Economic aspects--United States--Congresses.
Acid rain--Government policy--United States--Congresses.
Harvard subject headings:
Acid rain--Economic aspects--United States--Congresses.
Acid rain--Government policy--United States--Congresses.
Princeton subject headings:
Acid rain--Economic aspects--United States--Congresses.
Acid rain--Government policy--United States--Congresses.