Columbia subject headings:
Harvard subject headings:
Chemical industry--Accidents--United States--Prevention
Chemical industry--Computer network resources--Government policy--United States.
Chemical industry--Safety regulations--United States.
Chemical industry--Security measures--United States.
Chemical industry--United States--Safety regulations.
Chemicals--United States--Safety measures.
Hazardous substances--Computer network resources--Government policy--United States.
Princeton subject headings:
Chemical industry--Accidents--United States--Prevention.
Chemical industry--Computer network resources--Government policy--United States.
Chemical industry--Security measures--United States.
Chemicals--United States--Safety measures.
Hazardous substances--Computer network resources--Government policy--United States.