United States. Bureau of Labor Statistics. "Employed and Unemployed Persons by Occupation, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "May 2004," The Employment Situation (June 4, 2004) : 14-14. https://fraser.stlouisfed.org/title/144/item/494766/toc/509168 , accessed on March 28, 2024.