Columbia subject headings:
Harvard subject headings:
Chicago (Ill.)--Emigration and immigration--History.
German Americans--Employment--History.
German Americans--Employment--Illinois--Chicago--History.
Working class--Illinois--Chicago--History--19th century.
Working class--Illinois--Chicago--History--20th century.
Working class--Illinois--Chicago--History.
Princeton subject headings:
Chicago (Ill.)--Emigration and immigration--History.
German Americans--Employment--History.
German Americans--Employment--Illinois--Chicago.
Working class--Illinois--Chicago--History.