United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "August 1987," PPI Detailed Report (August 1987) : 97-114. https://fraser.stlouisfed.org/title/63/item/21621/toc/367264 , accessed on May 7, 2024.
United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "August 1987," PPI Detailed Report (August 1987) : 97-114. https://fraser.stlouisfed.org/title/63/item/21621/toc/367264 , accessed on May 7, 2024.