United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "March 1987," PPI Detailed Report (March 1987) : 96-113. https://fraser.stlouisfed.org/title/63/item/21616/toc/410790 , accessed on March 28, 2024.
United States. Bureau of Labor Statistics. "Machinery," in United States. Bureau of Labor Statistics. "March 1987," PPI Detailed Report (March 1987) : 96-113. https://fraser.stlouisfed.org/title/63/item/21616/toc/410790 , accessed on March 28, 2024.