United States. Bureau of Labor Statistics. "May 1968," CPI Detailed Report (May 1968). https://fraser.stlouisfed.org/title/58/item/22142, accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "May 1968," CPI Detailed Report (May 1968). https://fraser.stlouisfed.org/title/58/item/22142, accessed on April 25, 2024.