United States. Bureau of Labor Statistics. "Mining," in United States. Bureau of Labor Statistics. "October 1984," PPI Detailed Report (October 1984) : 151-151. https://fraser.stlouisfed.org/title/63/item/21587/toc/157439 , accessed on May 9, 2024.
United States. Bureau of Labor Statistics. "Mining," in United States. Bureau of Labor Statistics. "October 1984," PPI Detailed Report (October 1984) : 151-151. https://fraser.stlouisfed.org/title/63/item/21587/toc/157439 , accessed on May 9, 2024.