Columbia subject headings:
Harvard subject headings:
Food additives--Toxicology
Mutagenesis.
Nitrates--Toxicology.
Nitrites--Toxicology.
Nitroso compounds--Toxicology.
Princeton subject headings:
Food additives--Toxicology.
Mutagenesis.
Nitrates--Toxicology.
Nitrites--Toxicology.
Nitroso compounds--Toxicology.