United States. Bureau of Labor Statistics. "National Compensation Survey: Occupational Wages in the West North Central Census Division, July 2002 : Bulletin of the United States Bureau of Labor Statistics, No. 2562-4," National Compensation Survey: Occupational Wages in the United States (September 2003). https://fraser.stlouisfed.org/title/6084/item/584735, accessed on August 4, 2024.