United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "May 1988," PPI Detailed Report (May 1988) : 96-113. https://fraser.stlouisfed.org/title/63/item/21630/toc/151359 , accessed on May 11, 2024.
United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "May 1988," PPI Detailed Report (May 1988) : 96-113. https://fraser.stlouisfed.org/title/63/item/21630/toc/151359 , accessed on May 11, 2024.