United States. Bureau of Labor Statistics. "Mining," in United States. Bureau of Labor Statistics. "October 1983," PPI Detailed Report (October 1983) : 133-133. https://fraser.stlouisfed.org/title/63/item/21575/toc/202878 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Mining," in United States. Bureau of Labor Statistics. "October 1983," PPI Detailed Report (October 1983) : 133-133. https://fraser.stlouisfed.org/title/63/item/21575/toc/202878 , accessed on May 10, 2024.