Columbia subject headings:
Germany--Biography.
Labor unions--Germany--Biography.
Working class--Germany--Biography.
Harvard subject headings:
Germany--Biography.
Labor unions--Germany--Biography.
Working class--Germany--Biography.
Princeton subject headings:
Autobiography.
Germany--Economic conditions.
Germany--Social conditions.
Working class authors--Germany.
Working class writings, German--History and criticism.
Working class--Germany--History.