United States. Bureau of Labor Statistics. "Manufacturing Sector - Appendix - Annual Data," in United States. Bureau of Labor Statistics. "Fourth Quarter and Annual Averages, 1985," Productivity and Costs (January 29, 1986) : 15-15. https://fraser.stlouisfed.org/title/131/item/55791/toc/441107 , accessed on April 28, 2024.