Columbia subject headings:
Halocarbons--Analysis--Congresses.
Halocarbons--Environmental aspects--Congresses.
Hydrocarbons--Analysis--Congresses.
Hydrocarbons--Environmental aspects--Congresses.
Water--Pollution--Environmental aspects--Congresses.
Harvard subject headings:
Halocarbons--Analysis--Congresses.
Halocarbons--Environmental aspects--Congresses.
Hydrocarbons--Analysis--Congresses.
Hydrocarbons--Environmental aspects--Congresses.
Water--Pollution--Congresses
Water--Pollution--Environmental aspects--Congresses.
Princeton subject headings: