Columbia subject headings:
Heil family.
Industrialists--Germany--Worms--Biography.
Industries--Germany--Worms--History.
Leather industry and trade--Germany--Worms--History.
Worms (Germany)--Economic conditions.
Worms (Germany)--History--19th century.
Harvard subject headings:
Heil family.
Industrialists--Germany--Worms--Biography.
Industries--Germany--Worms--History.
Leather industry and trade--Germany--Worms--History.
Worms (Germany)--Economic conditions.
Worms (Germany)--History--19th century.
Princeton subject headings:
Heyl family.
Industrialists--Germany--Worms--Biography.
Leather industry and trade--Germany--Worms--History.
Worms (Germany)--Economic conditions.
Worms (Germany)--History--19th century.
Worms (Germany)--Industries--History.