Columbia subject headings:
Administrative procedure--United States.
Electric power-plants--Conversion to coal--Law and legislation--United States.
Electric power-plants--Law and legislation--United States.
Natural gas--Law and legislation--United States.
United States. Department of Energy.
Harvard subject headings:
Administrative procedure--United States.
Electric power-plants--Conversion to coal--Law and legislation--United States.
Electric power-plants--Law and legislation--United States.
Natural gas--Law and legislation--United States
United States. Department of Energy.
Princeton subject headings: