United States. Bureau of Labor Statistics. "May 1997," PPI Detailed Report (May 1997). https://fraser.stlouisfed.org/title/63/item/21740, accessed on April 17, 2024.
United States. Bureau of Labor Statistics. "May 1997," PPI Detailed Report (May 1997). https://fraser.stlouisfed.org/title/63/item/21740, accessed on April 17, 2024.