* Keil, Hartmut and Jentz, John B., eds. ''German Workers in Chicago: A Documentary History of Working-Class Culture from 1850 to World War I.'' (1988). 427 pp. | * Keil, Hartmut and Jentz, John B., eds. ''German Workers in Chicago: A Documentary History of Working-Class Culture from 1850 to World War I.'' (1988). 427 pp. |