Columbia subject headings:
Industrial relations--Ohio--Cincinnati--History.
Industries--Ohio--Cincinnati--History.
Working class--Ohio--Cincinnati--History.
Harvard subject headings:
Industrial relations--Ohio--Cincinnati--History.
Industries--Ohio--Cincinnati--History.
Working class--Ohio--Cincinnati--History.
Princeton subject headings:
Industrial relations--Ohio--Cincinnati--History--19th century.
Industries--Ohio--Cincinnati--History.
Working class--Ohio--Cincinnati--History--19th century.