Columbia subject headings:
Air--Pollution--Economic aspects--United States.
Atmospheric ozone--Reduction.
Chlorofluorocarbons--Environmental aspects--United States.
Environmental policy--United States.
Harvard subject headings:
Air--Pollution--Economic aspects--United States
Atmospheric ozone--Reduction.
Chlorofluorocarbons--Environmental aspects--United States.
Environmental policy--United States
Princeton subject headings:
Atmospheric ozone--Reduction.
Chlorofluorocarbons--Environmental aspects.
Fluorocarbons industry.