United States. Bureau of Labor Statistics. "September 1987," PPI Detailed Report (September 1987). https://fraser.stlouisfed.org/title/63/item/21622, accessed on March 28, 2024.
United States. Bureau of Labor Statistics. "September 1987," PPI Detailed Report (September 1987). https://fraser.stlouisfed.org/title/63/item/21622, accessed on March 28, 2024.