Columbia subject headings:
Harvard subject headings:
Electric power production--United States--Costs--Periodicals.
Electric power-plants--United States--Costs--Periodicals.
Steam power plants--United States--Costs--Periodicals.
Princeton subject headings:
Electric power production--United States--Costs--Periodicals.
Electric power-plants--United States--Costs--Periodicals.
Steam power plants--United States--Costs--Periodicals.