Columbia subject headings:
Harvard subject headings:
Benzofuran--Toxicology.
Dioxins--Toxicology
Polychlorinated dibenzodioxins--Toxicology.
Polychlorinated dibenzofurans--Toxicology.
Princeton subject headings:
Polychlorinated dibenzodioxins--Toxicology.
Polychlorinated dibenzofurans--Toxicology.