United States. Bureau of Labor Statistics. "Metal Products," in United States. Bureau of Labor Statistics. "May 1987," PPI Detailed Report (May 1987) : 159-166. https://fraser.stlouisfed.org/title/63/item/21618/toc/132883 , accessed on May 7, 2024.
United States. Bureau of Labor Statistics. "Metal Products," in United States. Bureau of Labor Statistics. "May 1987," PPI Detailed Report (May 1987) : 159-166. https://fraser.stlouisfed.org/title/63/item/21618/toc/132883 , accessed on May 7, 2024.