Columbia subject headings:
Chlorofluorocarbons--Congresses.
Global warming--Congresses.
Greenhouse effect, Atmospheric--Congresses.
Ozone layer depletion--Environmental aspects--Congresses.
Ozone layer depletion--Health aspects--Congresses.
Harvard subject headings:
Chlorofluorocarbons--Congresses.
Global warming--Congresses
Greenhouse effect, Atmospheric--Congresses
Ozone layer depletion--Environmental aspects--Congresses.
Ozone layer depletion--Health aspects--Congresses.
Princeton subject headings: