Columbia subject headings:
Environmental law--Vocational guidance--United States.
Natural resources--Law and legislation--Vocational guidance--United States.
Power resources--Law and legislation--Vocational guidance--United States.
Harvard subject headings:
Environmental law--Vocational guidance--United States.
Natural resources--Law and legislation--Vocational guidance--United States.
Power resources--Law and legislation--Vocational guidance--United States.
Princeton subject headings: