United States. Bureau of Labor Statistics. "Durable Manufacturing Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "First Quarter 1994 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (June 15, 1994) : 21-21. https://fraser.stlouisfed.org/title/131/item/55838/toc/485299 , accessed on April 24, 2024.