Columbia subject headings:
Harvard subject headings:
Labor--Germany (West)--History.
Labor--Germany--History.
Social structure--Germany (West)--History.
Social structure--Germany--History.
Working class--Germany (West)--History.
Working class--Germany--History--20th century
Working class--Germany--History--21st century.
Princeton subject headings:
Labor--Germany (West)--History.
Labor--Germany--History.
Social structure--Germany (West)--History.
Social structure--Germany--History.
Working class--Germany (West)--History.
Working class--Germany--History--20th century.
Working class--Germany--History--21st century.