Columbia subject headings:
Harvard subject headings:
Chlorohydrocarbons--Environmental aspects--European Economic Community countries.
Organobromine compounds--Environmental aspects--European Economic Community countries.
Water--Pollution--European Economic Community countries.
Princeton subject headings:
Chlorohydrocarbons--Environmental aspects--European Economic Community countries.
Organobromine compounds--Environmental aspects--European Economic Community countries.
Water--Pollution--European Economic Community countries.