United States. Bureau of Labor Statistics. "December 1968," CPI Detailed Report (December 1968). https://fraser.stlouisfed.org/title/58/item/22155, accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "December 1968," CPI Detailed Report (December 1968). https://fraser.stlouisfed.org/title/58/item/22155, accessed on April 25, 2024.