Columbia subject headings:
Dibenzofurans--Environmental aspects.
Dibenzofurans--Toxicology.
Dioxins--Environmental aspects.
Dioxins--Toxicology.
Organochlorine compounds--Environmental aspects.
Organochlorine compounds--Toxicology.
Harvard subject headings:
Dibenzofurans--Environmental aspects.
Dibenzofurans--Toxicology.
Dioxins--Environmental aspects
Dioxins--Toxicology
Organochlorine compounds--Environmental aspects.
Organochlorine compounds--Toxicology.
Princeton subject headings: