United States. Bureau of Labor Statistics. "National Compensation Survey: Chicago-Gary-Kenosha, IL-IN-WI, September 2004 : Bulletin of the United States Bureau of Labor Statistics, No. 3125-71," National Compensation Survey (Wages and Salaries) (June 2005). https://fraser.stlouisfed.org/title/6009/item/582828, accessed on September 16, 2024.