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