United States. Bureau of Labor Statistics. "Mining," in United States. Bureau of Labor Statistics. "May 1984," PPI Detailed Report (May 1984) : 145-145. https://fraser.stlouisfed.org/title/63/item/21582/toc/237250 , accessed on April 17, 2024.
United States. Bureau of Labor Statistics. "Mining," in United States. Bureau of Labor Statistics. "May 1984," PPI Detailed Report (May 1984) : 145-145. https://fraser.stlouisfed.org/title/63/item/21582/toc/237250 , accessed on April 17, 2024.