Columbia subject headings:
Acid rain--Environmental aspects--Illinois--Congresses.
Acid rain--Law and legislation--Compliance costs--Illinois--Congresses.
Acid rain--Law and legislation--Compliance costs--United States--Congresses.
Coal-fired power plants--Environmental aspects--Illinois--Congresses.
Environmental policy--Illinois--Congresses.
Harvard subject headings:
Acid rain--Environmental aspects--Illinois--Congresses.
Acid rain--Law and legislation--Compliance costs--Illinois--Congresses.
Acid rain--Law and legislation--Compliance costs--United States--Congresses.
Coal-fired power plants--Environmental aspects--Illinois--Congresses.
Environmental policy--Illinois--Congresses.
Princeton subject headings:
Acid rain--Environmental aspects--Illinois--Congresses.
Acid rain--Law and legislation--Illinois--Compliance costs--Congresses.
Acid rain--Law and legislation--United States--Compliance costs--Congresses.
Coal-fired power plants--Environmental aspects--Illinois--Congresses.
Environmental policy--Illinois--Congresses.