Columbia subject headings:
Harvard subject headings:
Aerosol therapy--United States.
Chlorofluorocarbons--Government policy--United States.
Chlorofluorocarbons--Law and legislation--United States.
Metered-dose inhalers--Safety regulations--United States.
Ozone layer depletion--United States.
Princeton subject headings:
Aerosol therapy--United States.
Chlorofluorocarbons--Government policy--United States.
Ozone layer depletion--United States.