Columbia subject headings:
Harvard subject headings:
Germany--Economic conditions--19th century.
Germany--Economic conditions--20th century.
Industrial location--Germany--History--19th century.
Industrial location--Germany--History--20th century.
Industries--Germany--History--19th century.
Industries--Germany--History--20th century
Princeton subject headings:
Germany--Economic conditions--19th century.
Germany--Economic conditions--20th century.
Industrial location--Germany--History--19th century.
Industrial location--Germany--History--20th century.
Industries--Germany--History--19th century.
Industries--Germany--History--20th century.