Columbia subject headings:
Ecology--Congresses.
Environmental toxicology--Congresses.
Heavy metals--Environmental aspects--Congresses.
Organohalogen compounds--Environmental aspects--Congresses.
Harvard subject headings:
Composés organohalogènes--Aspect de l'environnement--Congresses.
Ecology--Congresses
Environmental toxicology--Congresses.
Heavy metals--Environmental aspects--Congresses.
Métaux lourds--Aspect de l'environnement--Congrès.
Organohalogen compounds--Environmental aspects--Congresses.
Princeton subject headings:
Ecology--Congresses.
Environmental toxicology--Congresses.
Heavy metals--Environmental aspects--Congresses.
Organohalogen compounds--Environmental aspects--Congresses.