Columbia subject headings:
WHO Task Group on Environmental Health Criteria for Oxides of Nitrogen. Meeting (1976 : Tokyo, Japan)
Harvard subject headings:
Air--Pollution--Measurement--Congresses
Nitrogen oxides--Environmental aspects--Congresses.
Nitrogen oxides--Toxicology--Congresses.
Princeton subject headings:
Air--Pollution--Congresses.
Nitrogen compounds--Congresses.