Columbia subject headings:
Industrial management--Research--Germany--History--20th century.
Working class--Research--Germany--History--20th century.
Harvard subject headings:
Industrial management--Research--Germany--History--20th century.
Industries--Research--Germany--History.
Working class--Research--Germany--History--20th century.
Working class--Research--Germany--History.
Princeton subject headings:
Industrial management--Research--Germany--History--20th century.
Working class--Research--Germany--History--20th century.