Columbia subject headings:
Acid rain--Law and legislation.
Acid rain.
Air quality management--International cooperation.
Air--Pollution--Law and legislation.
Atmospheric ozone--Reduction.
Harvard subject headings:
Acid rain--Law and legislation
Acid rain.
Air quality management--International cooperation
Air--Pollution--Law and legislation
Atmospheric ozone--Reduction.
Princeton subject headings:
Acid rain--Law and legislation.
Acid rain.
Air quality management--International cooperation.
Air--Pollution--Law and legislation.
Atmospheric ozone--Reduction.