Columbia subject headings:
Costs, Industrial--United States.
Environmental policy--United States--Cost effectiveness.
Environmental protection--United States--Cost effectiveness.
Unemployment--United States.
Harvard subject headings:
Costs, Industrial--United States.
Environmental policy--United States--Cost effectiveness
Environmental protection--United States--Cost effectiveness.
Unemployment--United States
Princeton subject headings:
Costs, Industrial--United States.
Environmental policy--United States--Cost effectiveness.
Environmental protection--United States--Cost effectiveness.
Unemployment--United States.