Columbia subject headings:
Electric power distribution--Germany--High tension--History--20th century.
Electric utilities--Government ownership--Germany--History--20th century.
Energy policy--Germany--History--20th century.
Harvard subject headings:
Electric power distribution--Germany--High tension--History--20th century.
Electric utilities--Government ownership--Germany--History--20th century.
Energy policy--Germany--History--20th century.
Princeton subject headings:
Electric power distribution--Germany--High tension--History--20th century.
Electric utilities--Government ownership--Germany--History--20th century.
Energy policy--Germany--History--20th century.