Columbia subject headings:
Berlin (Germany)--Commerce--History.
Merchants--Germany--Berlin--History.
Middle class--Germany--Berlin--History--18th century.
Middle class--Germany--Berlin--History--19th century.
Social structure--Germany--Berlin--History.
Harvard subject headings:
Princeton subject headings:
Berlin (Germany)--Commerce--History.
Merchants--Germany--Berlin--History.
Middle class--Germany--Berlin--History--18th century.
Middle class--Germany--Berlin--History--19th century.
Social structure--Germany--Berlin--History.