Columbia subject headings:
German Americans--Employment--Illinois--Chicago--History--Sources.
German Americans--Illinois--Chicago--History--Sources.
German Americans--Illinois--Chicago--Social conditions--Sources.
German Americans--Illinois--Chicago--Social life and customs--Sources.
Working class--Illinois--Chicago--History--Sources.
Harvard subject headings:
German Americans--Employment--Illinois--Chicago--History--Sources.
German Americans--Illinois--Chicago--History--Sources.
German Americans--Illinois--Chicago--Social conditions--Sources.
German Americans--Illinois--Chicago--Social life and customs--Sources.
Working class--Illinois--Chicago--History--Sources.
Princeton subject headings:
German Americans--Employment--Illinois--Chicago--History--Sources.
German Americans--Illinois--Chicago--History--Sources.
German Americans--Illinois--Chicago--Social conditions--Sources.
German Americans--Illinois--Chicago--Social life and customs--Sources.
Working class--Illinois--Chicago--History--Sources.