United States. Bureau of Labor Statistics. Technology and Labor in Four Industries: Meat Products/Foundries, Metalworking Machinery, and Electrical and Electronic Equipment : Bulletin of the United States Bureau of Labor Statistics, No. 2104. Washington, D.C: U.S. Dept. of Labor, Bureau of Labor Statistics, January 1982, https://fraser.stlouisfed.org/title/5204, accessed on November 1, 2025.