United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "June 1987," PPI Detailed Report (June 1987) : 95-112. https://fraser.stlouisfed.org/title/63/item/21619/toc/45786 , accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "June 1987," PPI Detailed Report (June 1987) : 95-112. https://fraser.stlouisfed.org/title/63/item/21619/toc/45786 , accessed on April 23, 2024.