Columbia subject headings:
Carcinogens--Dictionaries.
Hazardous substances--Dictionaries.
Poisons--Dictionaries.
Toxicology--Dictionaries.
Harvard subject headings:
Carcinogens--Dictionaries.
Carcinogens--Handbooks, manuals, etc.
Hazardous substances--Dictionaries.
Hazardous substances--Handbooks, manuals, etc.
Poisons--Dictionaries.
Poisons--Handbooks, manuals, etc.
Toxicology--Dictionaries.
Toxicology--Handbooks, manuals, etc.
Princeton subject headings:
Carcinogens--Dictionaries.
Hazardous substances--Dictionaries.
Poisons--Dictionaries.