United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "June 1988," PPI Detailed Report (June 1988) : 96-113. https://fraser.stlouisfed.org/title/63/item/21631/toc/199983 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "June 1988," PPI Detailed Report (June 1988) : 96-113. https://fraser.stlouisfed.org/title/63/item/21631/toc/199983 , accessed on May 10, 2024.