United States. Bureau of Labor Statistics. "Durable Manufacturing Sector - Appendix - Annual Data," in United States. Bureau of Labor Statistics. "Third Quarter 2000 [Preliminary]," Productivity and Costs (November 2, 2000) : 14-14. https://fraser.stlouisfed.org/title/131/item/55750/toc/445457 , accessed on May 10, 2024.