United States. Bureau of Labor Statistics. "Manufacturing Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "First Quarter 1992 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (June 17, 1992) : 18-18. https://fraser.stlouisfed.org/title/131/item/55822/toc/464656 , accessed on April 30, 2024.