Columbia subject headings:
Harvard subject headings:
Commercial buildings--Power supply--Congresses.
Electric power distribution--Congresses
Electric power systems--Congresses.
Electric power-plants--Congresses.
Factories--Power supply--Congresses.
Princeton subject headings:
Commercial buildings--Power supply--Congresses.
Electric power distribution--Congresses.
Electric power systems--Congresses.
Electric power-plants--Congresses.
Factories--Power supply--Congresses.