United States. Bureau of Labor Statistics. "May 1991," CPI Detailed Report (May 1991). https://fraser.stlouisfed.org/title/58/item/19404, accessed on March 19, 2024.
United States. Bureau of Labor Statistics. "May 1991," CPI Detailed Report (May 1991). https://fraser.stlouisfed.org/title/58/item/19404, accessed on March 19, 2024.