Columbia subject headings:
Electric utilities--Canada.
Electric utilities--United States.
Energy policy--Canada.
Energy policy--United States.
Environmental policy--Canada.
Environmental policy--United States.
International interconnected electric utility systems--Canada.
International interconnected electric utility systems--United States.
Harvard subject headings:
Princeton subject headings:
Electric power distribution--Canada.
Electric power distribution--United States.
Foreign trade regulation--Canada.
Foreign trade regulation--United States.
International interconnected electric utility systems--Canada.
International interconnected electric utility systems--United States.