Columbia subject headings:
Polychlorinated biphenyls--Environmental aspects--Congresses.
Polychlorinated biphenyls--Toxicology--Congresses.
Harvard subject headings:
Polychlorinated biphenyls--Environmental aspects--Congresses.
Polychlorinated biphenyls--Toxicology--Congresses.
Princeton subject headings:
Polychlorinated biphenyls--Environmental aspects--Congresses.
Polychlorinated biphenyls--Toxicology--Congresses.