Columbia subject headings:
Industrialization--Germany--Saarland--History.
Industries--Germany--Saarland--History.
Harvard subject headings:
Industrialization--Germany--Saarland--History--19th century.
Saarland (Germany)--Economic conditions.
Princeton subject headings:
Industrialization--Germany--Saarland--History--19th century.
Saarland (Germany)--Economic conditions.