Columbia subject headings:
Arsenic--Health aspects.
Carcinogens.
Cobalt--Physiological effect.
Gallium.
Indium.
Tungsten.
Vanadium compounds.
Harvard subject headings:
Carcinogens--Congresses
Cobalt compounds--Carcinogenicity--Congresses.
Cobalt--Carcinogenicity--Congresses.
Gallium arsenide--Carcinogenicity--Congresses.
Indium phosphide--Carcinogenicity--Congresses.
Tungsten compounds--Carcinogenicity--Congresses.
Vanadium pentoxide--Carcinogenicity--Congresses.
Princeton subject headings: