Columbia subject headings:
Industrial revolution--Germany--History--19th century.
Industries--Germany--History--19th century.
Technological innovations--Germany--History--19th century.
Harvard subject headings:
Industrial revolution--Germany--History--19th century.
Industries--Germany--History--19th century.
Technological innovations--Germany--History--19th century.
Princeton subject headings:
Germany--Economic conditions--19th century.
Industrial revolution--Germany.