Columbia subject headings:
Atmospheric ozone--Congresses.
Atmospheric ozone--Research--Congresses.
Fluorocarbons--Environmental aspects--Congresses.
Stratosphere--Congresses.
Harvard subject headings:
Atmospheric ozone--Congresses.
Atmospheric ozone--Research--Congresses.
Fluorocarbons--Environmental aspects--Congresses.
Stratosphere--Congresses
Princeton subject headings:
Atmospheric ozone--Congresses.
Atmospheric ozone--Research--Congresses.
Fluorocarbons--Environmental aspects--Congresses.
Stratosphere--Congresses.