United States. Bureau of Labor Statistics. "Manufacturing Sector," in United States. Bureau of Labor Statistics. "Revised Second-Quarter [1987] Measures for Business, Nonfarm Business, and Manufacturing and Preliminary Measures for Nonfinancial Corporations," Productivity and Costs (August 31, 1987) : 8-8. https://fraser.stlouisfed.org/title/131/item/55804/toc/453106 , accessed on April 18, 2024.