Columbia subject headings:
Environmental law--United States.
Environmental policy--United States.
Social legislation--United States.
United States--Economic policy.
United States--Social policy.
Harvard subject headings:
Environmental law--United States
Environmental policy--United States
Social legislation--United States
United States--Economic policy.
United States--Social policy.
Princeton subject headings:
Environmental law--United States.
Environmental policy--United States.
Social legislation--United States.
United States--Economic policy.
United States--Social policy.