Columbia subject headings:
Dwellings--United States--Statistics--Periodicals.
Power resources--United States--Statistics--Periodicals.
Harvard subject headings:
Dwellings--United States--Statistics--Periodicals.
Power resources--United States--Statistics--Periodicals.
Princeton subject headings:
Dwellings--United States--Statistics--Periodicals.
Periodicals.
Power resources--United States--Statistics--Periodicals.
Statistics.