United States. Bureau of Labor Statistics. "December 1999," PPI Detailed Report (December 1999). https://fraser.stlouisfed.org/title/63/item/21772, accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "December 1999," PPI Detailed Report (December 1999). https://fraser.stlouisfed.org/title/63/item/21772, accessed on April 19, 2024.