Columbia subject headings:
Harvard subject headings:
Industrialists--Germany--Saarland--Biography.
Industries--Germany--Saarland--History.
Röchling (Firm)--History.
Röchling family.
Saarland (Germany)--Economic conditions.
Saarland (Germany)--History.
Princeton subject headings:
Iron industry and trade--Germany--History.
Röchling family.
Steel industry and trade--Germany--History.