Columbia subject headings:
Carcinogenesis--Congresses.
Environmentally induced diseases--Congresses.
Nitrosoamines--Analysis--Congresses.
Nitrosoamines--Toxicology--Congresses.
Harvard subject headings:
Carcinogenesis--Congresses.
Environmentally induced diseases--Congresses
Nitrosoamines--Analysis--Congresses.
Nitrosoamines--Toxicology--Congresses.
Princeton subject headings: