Columbia subject headings:
Electric industries--New York (State)--Niagara Falls.
Niagara Falls (N.Y. and Ont.)--Description and travel.
Harvard subject headings:
Electric industries--Niagara Falls.
Niagara Falls (N.Y. and Ont.)--Description and travel.
Princeton subject headings:
Electric industries--Niagara Falls.
Niagara Falls--Description and travel.