United States. Bureau of Labor Statistics. "Durable Manufacturing Sector," in United States. Bureau of Labor Statistics. "Third Quarter 1988 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (December 5, 1988) : 10-10. https://fraser.stlouisfed.org/title/131/item/55956/toc/456244 , accessed on April 25, 2024.