Columbia subject headings:
Chicago (Ill.)--Social conditions.
Meat industry and trade--Illinois--Chicago--History.
Packing-house workers--Illinois--Chicago--History.
Pork industry and trade--Illinois--Chicago--History.
Stockyards--Illinois--Chicago--History.
Harvard subject headings:
Chicago (Ill.)--Social conditions.
Meat industry and trade--Illinois--Chicago--History.
Packing-house workers--Illinois--Chicago--History.
Pork industry and trade--Illinois--Chicago--History.
Stockyards--Illinois--Chicago--History.
Princeton subject headings:
Chicago (Ill.)--Social conditions.
Meat industry and trade--Illinois--Chicago--History.
Packing-house workers--Illinois--Chicago--History.
Pork industry and trade--Illinois--Chicago--History.
Stockyards--Illinois--Chicago--History.