Down on the Killing Floor: Black and White Workers in Chicago's Packinghouses, 1904-1954by Rick Halpern;Unionizing the Jungles: Labor and Community in the Twentieth-Century Meatpacking Industryby Shelton Stromquist; Marvin Bergman;Cutting into the Meatpacking Line: Workers and Change in the Rural Midwestby Deborah Fink