United States. Bureau of Labor Statistics. "National Compensation Survey: Grand Rapids-Muskegon-Holland, MI, April 2004 : Bulletin of the United States Bureau of Labor Statistics, No. 3125-35," National Compensation Survey (Wages and Salaries) (December 2004). https://fraser.stlouisfed.org/title/6009/item/582792, accessed on January 26, 2025.